1 . If fish are jumping higher than usual or frogs are croaking more loudly, it________ rain.

A．must

B．may

C．shall

D．need

2 . The designer has tried every possible way to make the robot light, so you_______worry about its weight.

A．must

B．may

C．can't

D．needn't

3 . 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

4 . —________ you leave now? You only arrived an hour ago!
—Sorry, but so much homework is waiting for me.

A．Must

B．May

C．Can

D．Might

5 . 面临气候变化带来的多重挑战，所有相关各方应保持联系，加强合作，共同应对由此产生的对生活方方面面的影响。 (contact) (汉译英)

6 . —Must the government of Philippines (菲律宾政府) say sorry to China.
—Yes, they ________. Their behaviour has deeply hurt Chinese people.

A．need

B．must

C．can

D．may

7 . 因为出乎意料的暴力事件频发，出租车公司必须向乘客确保出行的安全。（assure）(汉译英）

8 . 尽管条件极其艰苦，我们必须坚持下去，直到成功。
We must ________ ________ till success in spite of the extremely difficult conditions.

9 . 选词填空

well off;   be keen on;   be ashamed of;   in all ;     on behalf of ;   refer to

1. They would never _________ that matter again.
2. You should _________ yourself for telling such lies.
3. In addition, a hero must be optimistic and diligent and_________ his hard work.
4. It won't be long before the Chinese people will become _________.
5. Please allow me to thank you for your offer of help _________ my colleagues.

10 . 选用适当的单词或短语补全对话
Boss: All the documents     1     （must/can） be prepared before the meeting starts
Secretary: I know that. Kelly has been working on the documents since last Monday. She     2    （may/must）have got everything ready but I am not sure.
Boss: Wheres Kelly then?
Secretary: She     3     （must/has to）be in the sales managers office now. I saw her go in there a minute ago.