20. According to the factory safety rules  all accidents    be reported to the safety officer.

A. may       B. can

C. would      D. shall

6. —How come you are always full of power even though you have such a tight schedule?

―Perseverance(毅力)is my __________ ( strong). Every day I spend more than

two hours taking exercise, you know.

5. He limits himself to_______ (drink) three cups of beer a day.

4. ________ (be) in heavy debt,they had to work day and night to pay it off.

3. ―Did you have a wonderful time at the ball last night?

―You bet！ I've never had a ______ (wonder) time all my life.

2. ―I have finished my homework.

―Oh,I _________ (think) you would finish it by the next day.

用所给词的适当形式填空

1. ―In this day and age, women can have children and jobs as well. ―I can't agree more. It's great to have the two __________(combine).

5.    为了找到一个更好的工作，他决定再学习一门外语。

In order to find a better job, he decided to study __________ foreign language. (a/an+序数词)

4. 我和我妻子都没有在考虑买那所不久就要拆除的老房子。

   ____________________considering buying the old house to be pulled down soon. (neither…nor…)

3.    天气那么好，我们都想出去散步。

It is ______________________ we all want to go out for a walk. (such... that...)