1 . 我们必须提高认识并采取行动减少塑料垃圾。（汉译英）
______________________________________________________________________

2 . During the special period of fighting against the infective illness, you ________ wear a mask when going out.

A．must

B．can

C．need

D．may

3 . 我们的言行必须一致。（corespond, behavior）(汉译英)

4 . 用方框中单词的适当形式完成下列句子，每个单词只能使用一次。

depress,        innovator,        official,        special            system,          react,             qualify

1. The government ________ announced the news to the reporters.
2. The first ________ of most participants to the experiment is fear.
3. Previous teaching experience is a necessary ________ for this job.
4. Despite the ________ result, Jenny didn’t give up and was determined to try again.
5. We must constantly ________ to keep up with the fast development of high technology.
6. Keep studying, and you can become an expert or a (an) _________ in something one day.
7. We are amazed at her ________ approach to the problem, which has been a fixed and efficient way for many years.

5 . 我非得给经理写一封信不可。
I ________ to the manager.

6 . 写出下列句子中must的含义
1. You must practice your spoken English if you want to improve. ________
2. Why must you always interrupt me? ________
3. She must be tired after such a long walk. ________

7 . 如果想要推进这项工程，我们俩必须共同努力。（汉译英）

8 . You __________________, if not, you will not be allowed to graduate.
你必须支付图书馆的罚款，不然的话，你将不被允许毕业。