17. 　　　years ago, there were many plants here.

　　 A. thousands of　　 B. two thousands of

　　 C. thousand of　　　 D. thousand

16. Who can teach me __ English well?

　　 A. how can I learn　　 B. how to learn

　　 C. how I can learn　　 D. B and C

15. Our teacher told us in class the earth 　　around the sun.

　　 A. traveling　　 B. to travel　　　 C. travels　　 D. traveled

14. Which do you think is the __ invention?

　　 A. second most important　 B. first important

　　 C. more important　　　　 D. very important

13. They have __ to visit their grandparents.

　　 A. gone　　　　 B. been　　　　　　 C. went　　　 D. already

12. When shall we go　 ?

　　 A. in our holidays　 B. for our holiday　 C. on holiday　 D. Band C

11. Could you tell me how much it __ for you to travel to Hainan last summer?

　　 A. costing　　　　 B. cost　　　　 C. costed　　　 D. worth

10. You’d better 　　them there It’s dangerous.

　　 A. tell, to stay　　　　　 B. to tell, to stay

　　 C. not tell, not stay　　 D. tell, not to stay

9.　 There isn’t any difference between the two. I really don’t know　

　　 A. where to choose　　　 B. which to choose

　　 B. C. to choose which　 D. to choose which one

8.　 There is a Christmas tree 　　in the comer of the sitting room.

　 　A. stands　　　 B. is standing　　 C. standing　　　 D. to stand