No air means death. Though we can't see it, there is air all around us, so air is everywhere and gives life to
every living thing.
      Without it we can't live. Bad air makes people ill. We must have fresh air to keep us in good health.
      In the city there are many people and there are too many cars running on the roads the gas which the cars
spread (传播) out is full of poison (有毒). Every day we breathe it in again and again. This makes us feel sick.
      Besides the cars, there are many factories too. From the chimneys (烟囱) of these factories, we usually get
black and grey smoke. This kind of smoke, when mixed with air, is dangerous to our health because it contains
much poisonous gas. So in order to keep ourselves healthy we should go out to the countryside to breathe more
fresh air.

1. Air is very important because _______.

A. We can't see it.
B. It is everywhere.
C. It gives life to every living thing.
D. It does no harm to people's health.

2. We must have fresh air to _______.

A. make our room healthy
B. keep us healthy
C. keep out house clean
D. see every thing clearly

3. The gas which the cars spread out is _______ the black smoke that comes out of the factories.

A. as grey as
B. as much as
C. as dense as
D. as little as

4. In the city, the air is not so clean as that _______.

A. in factories
B. out of doors
C. in the countryside
D. indoors

5. We can't get more fresh air when we are in _______.

A. hills
B. countryside
C. seaside
D. big cities

1. The boy is happy because he _________(sell) out all the newspapers.
2. The plan _________(give) up because of rain.
3. If it _________(not rain) tomorrow, we _________(go )fishing.
4. Where __________ you __________(be) these days?
5. Where is Tom? He _________(go) to the post office. He said he _________(come) back soon.
6. Mike says he _________(want )to be a worker after he _________ (finish )school.
7. The last bus _________ just ________(leave) when they ________(get) to the bus stop.
8. She _________(not go) to bed until she _______(finish) her work.
9. Light __________(travel )much faster than sound.
10. I _________(feel) much better after I _______(take) the medicine.
11. "Where ________we________(meet)?" "Let's meet outside the park gate."
12. I_________(be) afraid Mr Johnson _________(not visit) out school tomorrow.
13. I _________(lost) my bike. _________you _________(see) it anywhere?
14. ________this kind of car _________(produce) in Shanghai?
15. We __________(see) several members of the family since we ________(arrive)
16. I found that the students _________(play) football on the playground.
17. The shop __________(close) at this time of day.
18. Where ________your watch _________(lose)?
19. ________the doctor __________(send) for last night?
20. Three children ___________(take) good care by the nurse.
21. Some children ___________(take ) good care by the nurse.
22. Some new houses _________(build) by the villagers themselves.
23. What language ________(speak) in Australia?
24. The colour TV _________(buy) in that shop three days ago.
25. He said he __________(stay) here for another two days.
26. The doctor said Jim must ________(operate ) on at once.
27. "_________ the bridge _______(repair) yet?" "Yes, the workers_______ already______(repair) it."
28. We are in Grade One this year, so we _________(teach ) physics next year.
29. "Where _________(be) you last night?" "I_________(ask) to help Tom at home"
30. The big tree ________(blow)down in the storm last night.
31. I________ never ________(eat) such delicious noodles before.
32. When we reached the town, it _______(get) dark.
33. We ________(have) lunch when suddenly someone knocked at the door.
34. Lucy said she ________(visit) the school the next month.
35. I ________(wait) until he comes back.
36. You ________(watch) TV after supper, aren't you?
37. They _________(be) to that small village several times.
38. Can you tell me if it _________(snow) tomorrow?
39. Could you tell me if you _________(read) the story book?
40. He said the lights in the room _________(go) out when he opened the door.
41. I ________(be) fifteen soon.
42. Tom, your aunt _______(come) this afternoon .
43. My teacher often _________(tell) us not to play on the street.
44. They________(plant) trees on the hill. Do you see?
45. The teacher said that the earth ________(move) round the sun.
46. She said she _______(put) on a new coat the next day.
47. The Great Wall _________(know) all over the world.
48. Could you tell me where Alice ________ (live)?
49. ________the film ______(show) many times since last Sunday.
50. ________the street lights usually _______(turn) on at seven in summer evening?
51. I _______(not go) to the cinema because I ________(see) the film before.
52. It ________(get) dark. What about ________(go) home at once?
53. You ________(be) late if you __________(not hurry).
54. Use your head and you _________(find) a better way.
55. Look！Someone ________(lie) on the floor.
56. It __________(rain) harder now. It ________(rain) quite often in summer.
57. Here _______(come) the bus.
58. I don't know when the manager ________(return), but when he _________(come) back I ________(let)
      you know.
59. "Where ________(be) you this time yesterday?" "I________(be) at home. I _______(go) over my lessons
      then."