19.(　　 ) We’re going to learn _____ to plant trees.

A. what　　 B. which　 C. how　 D. that

18.(　　 ) ______ important ______ us to learn English well.

A. It’s, to　 B. It’s, for　 C. That’s, for　 D. That’s, to

17.(　　 ) The doctor ask me ______ let her in.

A. not to　 B. not　 C. don’t　 D. didn’t

16.(　　 ) The _______ you study, the _______ you will learn.

A. better, more　 　B. more, well　

C. more, good　　 D. harder, better

15.(　　 ) _______ your help, I’ve found my lost child.

A. Thank to　　　 B. Thank for　

C. Thanks to　　 D. Thanks for

14.(　　 ) Can the museum ________ next year?

A. built　 B. be built　 C. build　　 D. will be built

13.(　　 ) The dictionary mustn’t _________ away from the library.

A. be taken　 B. take　 C. taken　 D. are taken

12.(　　 ) The students _____ made _____ their homework once again.

A. is, do　　　　　 B. was, to do　

C. were, done　　　 D. were, to do

11.(　　 ) The key ______ for locking the classroom door.

A. uses　 B. is using　　 C. is used　 D. use

10.(　　 ) They’ve been at this city ______ January.

A. in　 B. since　 C. for　　 D. during