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Cho 10,6 g Na2CO3 vào 12 g dd H2SO4 98% sẽ thu duoc dung dich B ? Tính nồng độ mol của các ion trong dd B
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1. When the children saw their parents, they __________ up and ____________. a. standing/leaving b. stood/left c. stand/leave d. will stand/leave 2. When I come back home, I _________ dinner for my son. a. will cook b. cook c. cooking d. cooked 3. When I was watching TV show, I __________ a pop star. a. have seen b. see c. see d. saw 4. When you ________ tomorrow, we___________ our house. a. come/ clear b. coming/clearing c. will come/ clear d. come/ will clear 5. I haven’t come back home since I ____________ at university. a. have learned b. will learned c. learned d. learning 6. When you finish your course, I __________married you. a. will get b. get c. got d. was getting 7. When I saw my sister, I _________ her a gift. a. give b. will give c. gave d. was giving 8. When I see my brother, I __________ him a gift. a. give b. will give c. gave d. was giving 9. This is the first time, I __________ such a beautiful girl. a. ever met b. have ever met c. was meeting d. will meet 10. I can’t go shopping with you because I _________ my homework yet. a. haven’t finished b. had finished c. didn’t finish d. finish 11. The operation involves _______________a small tube into the heart a. inserting b. to insert d. inserted d. insert 12. I hate him ____________me what to do all the time. a. telling b. tell c. told d. have told 13. I always hate _____________in public. a. speak b. speaking d. spoken d. be spoken 14. We've had to postpone ______________to France because the children are ill. a. go b. to go c. went d. going 15. I heard the orchestra _________ at Carnegie Hall last summer. a. playing b. play c. to play d. played 16. He had tried __________ a language before he left school. a. to learn b. learn c. learned d. learning 17. I meant ___________ school earlier, but I had to have breakfast. a. going b. go c. to go d. went 18. My teacher stopped ______________ because the student was too noisy. a. teach b. to teach c. taught d. teaching 19. When you take the scissors, remember ____________them back. a. to put b. put c. putting d. was putting 20. I think I'd advise him _____________the company. a. leaving b. to leave c. left d. leave 21. Some employment lawyers have advised employers ____________staff now, before the limit for compensation is raised. a. to dismiss b. dismiss c. dismissing d. dismissed 22. Her proposals would allow more people __________in full-time education. a. stay b. staying c. to stay d. have stayed 23. I suggested _____________ the matter to the committee. a. to put b. put c. putting d. is putting 24. I suggest we ______________a while before we make any firm decisions. a. wait b. waiting c. to wait d. waited 25. From the window we could see the children_________ in the yard. a. was playing b. play c. to play d. playing 26. Jacqui saw the car ____________up outside the police station. a. driving b. drive c. to drive d. drove 27. I try to avoid _____________shopping on Saturdays because the stores are so crowded. a. going b. have gone c. went d. to go 28. In the end, we decided ____________to the theatre. a. going b. having gone c. to go d. go 29. I'd expected _______________weight on when I gave up smoking, but I didn't. a. putting b. to put c. was put d. put 30. They're lucky __________such a nice office to work in. a. having b. have c. to have d. had 31. By the time you finish cooking, they ____________their homework. a. do b. have done c. doing d. will have done 32. By the time you ___________ dinner, the film will have ended. a. will finish b. will have finished c. finish d. is finishing 33. At 5 p.m yesterday, I __________ football with old friends. a. was playing b. had been playing c. played d. playing 34. At 9 a.m tomorrow, I ____________ English at school. a. was learning b. will be learning c. learn d. have learned 35. I will call you as soon as I __________back our school. a. came b. come c. will come d. is coming 36. By the time you were born, we _________ a town house. a. buy b. will buy c. bought d. had bought 37. Last night, I _________ to music when power ____________ a. was listening/fail b. listened/failing c. was listening/failed d. listened/ is failing 38. I ________ some soup for Cindy but she said she wasn’t hungry. a. heat b. heating c. have heated d. heated 39. When Cindy _________ her exam at the college, I’ll take her out for dinner at the Continental. a. passes b. passed c. will pass d. pass 40. This is the last time, I _________ sugar after 9 p.m. a. eating b. ate c. have ate d. will eat

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