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.

用所給詞的適當(dāng)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.    為了找到一個(gè)更好的工作，他決定再學(xué)習(xí)一門外語(yǔ)。

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

4. 我和我妻子都沒(méi)有在考慮買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.    天氣那么好，我們都想出去散步。

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