1.Fill in each gap with an appropriate preposition.
21. The teacher divided class ________four groups.
22. He provide us ________a lot of useful information.
23. The ground is covered ________trash. You should clear ________all the trash.
24. Raw sewage is pumped directly ________the sea.
25. They are trying to save the animals ________extinction.
26. The world will end ________like a second-hand junk-yard.
27. I am looking forward ________hearing from you.
28. Don’t throw trash ________the water.
2.Give the correct form of the verbs in brackets.
29. If the rice padddies are polluted, the rice plants ________________. (die)
30. If we ________on littering, the environment will become seriously polluted. (go)
31. What _________they ________________if they work hard today? (achieve)
32. If you ________________a chance to study in a foreign country, just take it. (get)
33. Plants ________________if they don’t get the sun and water. (die)
34. I am looking forword to ________________from you (hear)
35. I suggest ________________by bus. (travel)
36. If you don’t study harder, you ________________the final exam. (not pass)
37. She ________________terribly sorry if he dies. (feel)
38. Go with me and I________________you my new car. (show)