1 . You’d better conduct the experiment ________ your professor have instructed you; otherwise you may fail to complete it.

A．that

B．which

C．as

D．when

2 . He had to be called two or three time ________ he would switch off the computer and sit down to dinner.

A．until

B．before

C．when

D．as

3 . Della was shocked not to find her car ________ she had parked it the night before and phone the police immediately.

A．where

B．which

C．in which

D．around which

4 . Handwritten documents are more valuable to researchers, historians say, ________ their reliability can be confirmed.

A．though

B．so that

C．while

D．because

5 . English is a course for anyone in university, ________ his or her major or previous educational qualifications are.

A．no matter

B．whether

C．however

D．whatever

6 . 既然你糟糕的书写已经给考试成绩带来了不好的影响，是时候该改变自己的书写习惯了。( it is time)（汉译英）

7 . 尽管他觉得这个有关于节省劳动力装置的建议值得尝试，但最终他还是没有采纳。（worth）(汉译英）

8 . The proposal, debated at this year’s CITES Conference, lists Mako sharks under Appendix II, meaning that they can’t be traded ______ it can be shown that fishing wouldn’t threaten their chances for survival.

A．until

B．unless

C．whether

D．when

9 . 西斯廷大教堂的穹顶是如此的令人惊叹，让我移不开眼。(tear) （汉译英）

10 . 今天下午我没空，我和牙医有约。(appointment) （汉译英）