19. The shop assistant showed a hat _____ red silk to us.

A. made from　 　　B. made of　 　　C. was made of　 　　D. was made from

18. We found the ground ____ snow.

A. cover with　 　　　　　　　　　　B. is covered with　

C. was covered with 　　　　　　　　D. was covering with

17. The guide said that the dinosaur eggs ____ about 95 million years ago.

A. lay　　　　　　 B. were lay　

C. laid　　　　　 D. were laid

16. Mary ___ an English song in her room last night.

A. was heard to sing　 　　　　　　　B. is heard to sing　

C. was heard singing 　　　　　　　D. is heard singing

15. Mary ___ some songs in her room in the morning.

A. heard sing　 B. heard to sing　 C. was heard sing　 　　D. is heard to sing

14. Nothing can stop us ___ English.

A. learn　　　　 B. learning　 　　　　　C. learned 　　　　　　　D. learns

13. We are always kept ____.

A. to smoking　 B. on smoking　 C. from smoking　 　　D. off smoking

12. They ___ to help the farmers with the harvest last autumn.

A. asked　　　 　　　　　　B. asking

C. to ask　　　 　　　　　　D. were asked

11. Dinosaurs ____ about 65 million years ago.

A. were disappeared　 　　　　B. are disappeared　

C. disappeared 　　　　　　　D. disappear

10. What ___ the forest in China in the last ten years?

A. Has happened to 　　　　　　　B. Was happened to

C. Has happened at　 　　　　　　D. Has been happened to