Dưới tác dụng của một lực 100N có phương nằm ngang, làm vật dịch chuyển một quãng đường dài 10m. Tính công của lực đó.

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GIẢI GIÚP MÌNH VỚI II. Put each verb in bracket into a suitable tense 26. Why didn’t you attend the meeting? Oh, I did not know. If I (know)…………… I (come) …………………..there. 27. What ………….we(do)………… if they do not come tomorrow? 28. If I had enough time now, I (write) ………………………………. to my parents. 29. It’s too bad Helen isn’t here. If she (be) …….. here, she (know) ………..what to do. 30. If I (eat) …… breakfast tomorrow morning, I ( not get) ………. hungry during class. 31. If she (come) …………….. late again, she (lose) ……………………her job. 32. I (let) ………………. you know if I (find) ………………. out what’s happening. 33. If we (live) …………………………. in a town, life would be better. 34. I’m sure he wouldn’t mind if we (arrive) ……………………………. early. 35. We (phone) ……………………. you if we have time. 36. If I won the lottery, I (give) …………………. you half the money. 37. It (be) ………………….. a pity if she married Fred 38. If I’m free on Saturday, I (go) ………………………….. to the mountains. 39. She (have) ………………………….. a nervous breakdown if she goes on like this. 40. I know I (feel) better if I (stop) …………………… smoking. 41. If I (be) …………………… you, I (help) ………………………… him. 42. I (understand)………………… ….. him if he (speak) ……………….. more slowly. 43. He didn’t listen to the teacher. If he (listen) ……………….. carefully, he (perform) …………………… well in the examination. 44. He’s waiting for his mother to come back from Chicago. If his mother (come) …………………. home, he (have) ………………. a lot of presents. 45. He wanted to buy some Christmas presents but he couldn’t. If he (afford) ……….. to buy, his children (be) ………………. very happy to greet a new year. 46. The kitchen will look better if we (have) …………………………….. red curtains. 47. If I knew his address, I (go) ………………….. round and see him. 48. If you (not be) ……………. so busy, I (show) …………………… you how to play. 49. It (be) ………………………………… quicker if you (use) a computer. 50. If we (have) ……………….. some eggs, I (make) ……………………… you a cake.