Tìm x biết: 1/3+1/6=1/10+.....+2/x(x+1)=2016/2017

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Complete the following sentences with the words in brackets. 1. If it doesn't _______________ (rain), plants cannot grow. 2. If I _______________ (try) to cook, I ruin the food. 3. If you smoke, your skin _______________ (age) more quickly. 4. If you heat ice, it _______________ (melt). 5. I feel good if you _______________ (visit) me regularly. 6. Water evaporates if you _______________ (boil) it. 7. Deren _______________ (cycle) to work if the weather is good. 8. I feel sick if I _______________ (eat) too much chocolate. 9. You need to take my sister to the hospital if she _______________ (drink) milk as she is allergic to it. 10. If Andy _______________ (go) to bed late, he cannot wake up early. 11. If I don't do my homework, my teacher _______________ (get) angry. 12. If I _______________ (be) taller, I _______________ (join) in NBA when I was young. 13. Do you think you _______________ (be) happier now if you (be) someone else. 14. Lucas _______________ (be) in Los Angeles now if he _______________ (take) the flight yesterday. 15. The teacher _______________ (be) so angry now if you _______________ (forget) your homework at home. 16. If you _______________ (go) your office early, you _______________ (be) with us now. 17. I cannot _______________ (see) well if I don't have my glasses. 18. If you study hard enough, you _______________ (get) very good grades. 19. If somebody makes noise in the library, our teacher _______________ (punish) them. 20. If I miss the bus, I _______________ (take) a cab. 21. Coffee _______________ (taste) better if you add sugar. 22. You should _______________ (eat) less if you want to lose weight. 23. I always take my umbrella with me if it _______________ (rain). 24. If you _______________ (press) that button, the car starts. 25. If you _______________ (break) anything, you pay for it. 26. A: We had a great time at Drew's house Sunday. Why didn't you come? B: I had to study for Spanish. A: If you _______________ (come) with us, you _______________ (see) an awesome movie.

Complete the following sentences with the words in brackets. 28. If you (move) _______________ to the UK you would have to learn to speak English. 29. She (not/buy) _______________ it if she didn’t think she needed it. 30. The salad (taste) _______________ better if you added some garlic. 31. We (grow) _______________ our own vegetables if we had a garden. 32. What will you do if the boat (sink) _______________ . 33. When the sun (shine) _______________ I like to lie on the beach. 34. If I _______________ (have) a yacht, I would sail around the world. 35. If David _______________ (be) taller, he could even play in NBA. 36. If you _______________ (be) eighteen years old, you could drive a car. 37. Would you teach me if you _______________ (know) how to ride a bike? 38. If I _______________ (see) a spider, I would scream. 39. If Andrew _______________ (win) the lottery, he would buy a big house for us. 40. I would be so pleased if Jessica _______________ (come) to my party. 41. If Danny really _______________ (love) you, he wouldn't break your heart all the time. 42. Robin could lead a healthier life if she _______________ (give up) smoking. 43. If I _______________ (be) in your shoes, I would change my car. 44. If Pamela _______________ (have) a job, she would be so happy. 45. If he _______________ (speak) more clearly, I would be able to understand him. 46. What would you _______________ (do) if there was a fire at your house? 47. If drivers _______________ (obey) the traffic rules, there would be fewer accidents. 48. If Samantha _______________ (eat) healthier food, she wouldn't have to be on a diet. 49. I would _______________ (make) a delicious sandwich if you were hungry. 50. If I _______________ (know) your phone number, I would call you. 51. How would you feel if you _______________ (lose) your job? 52. If Thomas _______________ (propose) to me, I would say yes at once. 53. If she _______________ (apologize) to me, I would forgive her.

Complete the following sentences with the words in brackets. 1. What would you do if you suddenly (win) _______________ half a million pounds? 2. If he (get up) _______________ up earlier, he'd get to work on time. 3. If we (have) _______________ more time, I could tell you more about it. 4. If you (sell) _______________ more products, you'd earn more money. 5. I could help you if you (trust) _______________ me more. 6. I'd come to your party if I (finish) _______________ my project. 7. I wouldn't be able to do it unless you _______________ (help) me. 8. If it got dark we (not find) _______________ the way. 9. I'd sit down here if you (not mind) _______________. 10. If you turned up the radio we (hear) _______________ the news. 11. If the weather was nice I _______________ (go) out with you. 12. I would tell you the truth if you (not laugh) _______________at me. 13. How much would it cost if we (pay) _______________ in advance? 14. He (cannot go) _______________ to the States unless he asked for a visa. 15. What would you do if you (lose) _______________ your passport? 16. If I missed the bus, (you – take) _______________ me by car? 17. He wouldn't agree with it if it (not be) _______________ fair. 18. His car would be a lot safer if he (buy) _______________ some new tires. 19. The children could be better swimmers if the (go) _______________ swimming more frequently. 20. I wouldn't mind having children if we (live) _______________in the country. 21. If I (be) _______________ you, I wouldn't worry about going to university. 22. If I (have) _______________ any money, I'd give you some. 23. Your parents (be) _______________ a lot happier if you phoned them more often. 24. I (write) _______________ to her if I knew her address. 25. I wouldn’t mind living in this country if the traffic (not/be) _______________ so bad. 26. If I showed you how to open the safe, (you/promise) _______________ not to tell anyone? 27. If the police come looking for you I (say) _______________ you have left the country.

Complete the following sentences with the words in brackets. 26. You (get) _______________ one point when you (answer) _______________ a question correctly. 27. I (meet) _______________ you in the square, unless you’d prefer to meet somewhere else. 28. If you (buy) _______________ a car, I (sell) _______________ my motorbike. 29. The rules of this club are very strict; if you (break) _______________ them, you are asked to leave. 30. He will never get promoted unless he (learn) _______________ to be more polite to customers. 31. If you really want me to, I (take) _______________ the dog to the vet. 32. Her father will be angry if she _______________ to this party. (go) 33. If he _______________ so hard, he will ruin his health. (work) 34. He _______________ English quicker if he goes to England. (learn) 35. Will her ticket still be valid if she _______________ the plane? (miss) 36. I will phone you if I _______________. (not / forget) 37. My parent _______________ me if I am in financial troubles. (not / help) 38. I will allow you to take my car if you _______________slowly. (drive) 39. She will come if she _______________busy. (not / be) 40. If we _______________in groups, we will finish it quicker. (work) 41. You _______________this problem if you read his paper. (solve) 42. They will not work properly unless you _______________them good wages. (pay) 43. What _______________if he does not send the money? (they / do) 44. Unless you are careful you _______________the job. (lose) 45. You will lose all your money if you _______________cards with them. (play) 46. If you _______________the radio like that you will damage it. (use) 47. He will produce the film if we _______________him money. (lend) 48. You _______________your fingers unless you use gloves. (burn) 49. If you _______________what I told you, you'll find the place easily. (remember) 50. He _______________if you continue turning the radio up so loud. (be angry)

Complete the following sentences with the words in brackets. 1. When autumn (come) _______________ , the leaves (fall) _______________ from the trees. 2. He works flexible hours; if there is not much to do, he (come) ______________ home early. 3. If you _______________ (finish) your homework, you can go out. 4. If David _______________ (get) a good grade from his English presentation, I will take him to the movie theater. 5. If there _______________ (be) traffic, we will use the subway. 6. I will go to New York next week if I _______________ (find) a cheap ticket. 7. If you don't accept the offer, you _______________ (regret) it later. 8. If Helen apologizes to me, I _______________ (forgive) her. 9. If Deren _______________ (buy) a car, he will drive us to school. 10. We want to see the White House if we _______________ (visit) Washington. 11. If you don't study regularly, you _______________(fail) in your exams. 12. If David _______________ (arrive) on time, I will be very surprised. 13. If we don't protect the tigers, they _______________ (extinct) soon. 14. You can see better if you _______________ (turn on) the light . 15. If you don't take a cab now, I am afraid we _______________ (be) late for the meeting. 16. If Andre _______________ (get) a decent job offer, he will settle down here. 17. If My mother _______________ (put aside) enough money, she will buy a new dress for herself. 18. The teacher _______________ (be) very angry if Lucas doesn't hand in his assignment today. 19. Robin _______________ (do) the shopping if I cook dinner. 20. If we don't put on our jackets, we _______________ (catch) cold. 21. If Robin _______________ (have) time on the weekend, he will come to see us. 22. If you _______________ (study) harder, you can pass the exam. 23. Unless you (apologise) _______________, I’ll never talk to you again. 24. If you (pick) _______________ me up from work today, I (buy) _______________ you a drink. 25. If you (boil) _______________ soup, it (spoil) _______________ the flavour.