1 . He must be forty years old ___________ his wife looks about twenty. （用适当的单词填空）

2 . 阅读下面句子，在下面句子的空白处填入1个适当的单词或括号内单词的正确形式。
1. The Chinese government has taken a variety of effective ______________(measure) to fight against Covid 2019.
2. It is said that body language accounts for 55 percent of a first impression ____________what you say just 7 per cent.
3. My father warned me against going to Beijing during May Day because it was ____________ (crowd) with tourists.
4. It is universally acknowledged that Shanghai is the most important ____________ (industry) base of China.
5. If a person is badly injured in an accident, you'd better leave____________ he was.
6. When the doctors and nurses left Wuhan, all the patients looked ____________(thankful) at them with tears of gratitude filling their eyes.
7. The fires burned for three days,____________(destroy) a total of 25,000 buildings.
8. I shook hands and exchanged a few words____________ the manager after the meeting.
9. The first time he met the girl he ____________ (strike) by her wisdom and fell in love with her.
10. As long as there is the____________ (possible) of saving our planet, take action now before it is too late.

3 . I had been puzzled over the problem for over an hour without any result, ____ all at once the solution flashed across my mind.

A．while

B．when

C．then

D．as

4 . _______ he was the last man I wanted to see, I did all that I could to help him.

A．As

B．Now that

C．While

D．As though