Hơi nước có ý nghĩa như thế nào trong khí quyển? Không có vai trò gì đáng kể. Ảnh hưởng quyết định đến thời tiết và khí hậu. Là nguồn cung cấp nước mưa. Là nguồn gốc của các hiện tượng khí tượng.

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I/ Give the correct form of the verbs in brackets: 1. Tom regrets ( spend ) too much time ( play ) computer games . 2. Students stopped ( make ) noise when the teacher came in . 3. He’ll try ( not make) the same mistake again. 4. Would you mind ( turn ) off the radio ? 5. When you see Tom, remember ( give ) him my regards. 6. They postponed ( build ) an elementary school for lack of finance. 7. It’s no use ( advise ) him. He never allows anybody (give) advice. 8. Is there anything here worth ( buy ) ? 9. We missed ( watch ) a football match last night . 10. The principal tells him ( come ) in . 11. My parents decided ( take ) a taxi because it was late. 12. Do you agree ( lend ) me some money ? 13. Tom refused (give) me his address . 14. You’ll be able ( do ) it yourself when you are older . 15. I didn’t know how ( get ) to your house, so I stopped ( ask ) the way . 16. We found it very difficult ( reach ) a decision. 17. I will remember ( give ) Mr. Brown your message. 18. She remembers ( be ) taken to the zoo by her mother . 19. Do you feel like ( go ) to the concert or would you like ( stay ) at home ? 20. My family is considering (take) a trip to the USA next year. 21. The police didn’t permit ( camp ) in this wood for security reasons . 22. We don’t allow people ( smoke ) in the lecture room. 23. The teacher advised ( review) the grammatical structures carefully . 24. He’ s used to ( go ) on foot to work . 25. We get used to ( work ) on Sundays. 26. She is looking forward to ( see ) her friends . 27. Sometimes students avoid ( look ) at the teacher if they don’t want (answer ) a question. 28. You should try ( wear ) any shirts you want to buy. 29. The teacher recommends us ( prepare) the lessons well before ( come ) to class. 30. There are people can’t help ( laugh )when they see someone ( slip ) on a banana skin 31. He went to bed without ( lock ) the doors . 32. They don’t have enough patience ( wait ) for him . 33. Gravity makes water ( run ) downhill . 34. This man let me ( use ) his phone yesterday. 35. Are we allowed ( go ) out with Tom ? 36. The teller was made ( raise ) his hands . 37. Mary was advised ( stay ) out of the crowd . 38. She prefers ( eat ) to ( prepare ) meals . 39. When the rainy season comes , you need ( repair ) the roof of the house . 40. The flowers need ( water ) but you needn’t ( water ) them now.