21、_____________ difficulties we meet, we can work them out.

A. Whatever    B. However    C. Wherever D. Whenever

20、I have to say you came here ten minutes later than ______________.

A. requiring   B. to require   C. require   D. required

19、All the students______________ in the chemistry lab with their eyes_________ the teacher.

A. are seated; watching carefully          B. sat; carefully watching

C. seat; watched carefully                   D. sit; carefully watched

18、―She hardly goes out on Sundays.

―________. She likes to remain at home reading.

A. No, she doesn't            B. No, she does

C. Yes, she doesn't           D. Yes, she does

17、―What is the model plane like?

―Well, the wings of the plane are______________ of its body.

A. more than the length twice         B. twice more than the length

C. more than twice the length         D. more twice than the length

16、 The meeting was expected to start at 9 o'clock but the manager didn't turn up[CD#2] twenty minutes later.

A. before       B. until          C. after     D. since

15、The teacher as well as the students_________ the boy's handwriting.

A. think highly of                B. thinks highly of

C. sing high praise for         D. sings highly praise for

14、Do you know_________ speaker of_________ Chinese language also has difficulty in learning_________ Japanese?

A. the; the; a    B. a; the; 不填    C. the; the; the    D. a; 不填; the

13、 Chemicals in the body______________ our food into useful substance.

A. mix up      B. deal with  C. bring in     D. break down

12、To do a bit for the motherland, _______________

A. working hard is necessary

B. to learn a foreign language is needed

C. it is important to master science

D. one should serve the people whole heartedly