1 . ______ you know little about the Qing and Ming dynasties, you’d better read more books about them.

A．Unless

B．Since

C．Although

D．Whether

2 . The sharing economy is expanding at such a rate ________ we can only imagine ________ it will comprise in the future.

A．as; that

B．that; what

C．as; which

D．that , that

3 . The fear is that ______we don’t start taking this litter out of the sky soon, it will become a significant   threat to active satellites. (用适当的词填空)

4 . __________ the host call her name, her heart started to beat fiercely.

A．Hearing

B．When hearing

C．Heard

D．When she heard

5 . If you study hard, you________ more options for your future.

A．has

B．have

C．had

D．will have

6 . Dr. Wu promised that he wouldn’t stop doing operations ________ he was too weak to.

A．if

B．unless

C．when

D．because

7 . ______ great achievements the world may have in the future, the part China will play can't be left out.

A．If

B．Whatever

C．Whichever

D．However

8 . People who often exercise and stay active are much less likely to develop heart disease than people who rarely move, ________ that exercise consists of a few minutes a day of jogging or multiple hours a week of walking.

A．on condition

B．whether

C．for

D．no matter

9 . ______he wants to convey, the writer is expected to be good at summarization and Chinese to produce a couplet with several characters that is excellent in both content and language. (用适当的词填空)

10 . 这本书值得反复阅读，它生动地描述了20世纪30年代的上海。(worth) (汉译英)