1 . People liked O. Henry’s stories, because simple as the tales were, they ______ finish with a sudden change at the end, to the readers’ surprise.

A．could

B．would

C．might

D．must

2 . If someone happens to have high fever and pneumonia, he or she _________ seek treatment fast.

A．must

B．needs

C．may

D．could

3 . Timmy, why        in the mud? I have already told you so many times not to!

A．must you sit

B．should you sit

C．will you sit

D．can you sit

4 . 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

5 . Just as I was hurrying to class, there ________ come Tom with a long story to tell you.

A．could

B．must

C．might

D．would

6 . It’s red light now. We _________stop and wait.

A．can

B．must

C．should

D．might

7 . Public health experts kept telling citizens it was of utmost importance that social distancing and hygiene habits ________ amid the pandemic.

A．were to be kept	B．had to be kept
C．must be kept	D．should be kept

8 . 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.

9 . 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. ________

10 . 为了在竞争激烈的广告界脱颖而出，他们必须将最高水准的设计与创造性的方法结合起来。（汉译英）