Unit 21 Warm-up & Lesson 1

I. 根据本部分所学单词及所给的提示写出所缺单词的正确形式。

1. Matthew gave a l________ excuse for being absent - I didn't believe it.

2. Laura knocked on the door and after a brief i________ it was opened.

3. The manager's approval was of ________ (极度的) importance.

4. If you're both going to lie, at least stick to the same story and don't c________ each other!

5. Fish is easy to ________ (消化) when you're ill.

6. We need to make f________ changes to the way in which we treat our environment.

7. Wearing seat belts in cars is ________ (强制性的) by law.

8. Your book looks more interesting than mine; do you want to s________ with me?

9. The changes are bound to be ________ (有争议的).

10. It was d________ whether the patient would survive the operation.

11. The school trip has become a(n) ________ (一年一次的) event.

II. 选用方框内所给的短语并用其适当形式填空（每个短语限用一次）。

take part in, slow down, come across, be prepared to, worry about, find out 1. I ________ lend you the money if you promise to pay it back.

2. Lack of demand will ________ our economic growth.