prevents infection.

10．Alcoholic drink can have a bad effect on your body.

Ⅳ. 完成句子

1．In winter，you should cover something to protect the plants from(保护......免受......伤害) the cold.

2．He is in great danger(处于极度危险中)．

3．You should pay attention to(注意) the signs when you are driving.

4．My family lives in peace(相处融洽)．

5．Dinosaurs died out(灭绝) millions of years ago.

6．The storm had a bad effect on(对......有坏影响) the crops.

7．I'd appreciate it(我将不甚感激) if you could come to my birthday party next Saturday evening.

8．On hearing the funny words from his son，she burst into laughter/burst out laughing(大笑起来)．

9．I long to go to university(渴望上大学) to get more useful knowledge.

10．After finishing the test paper，I went out to the classroom in relief(如释重负)．

V．单项选择

1.If she had worked harder, she_____.

A.would succeed B.had succeeded

C.should succeed D.would have succeeded

2.If my lawyer___here last Saturday, he____me from going.

A.had been; would have prevented

B.had been, would prevent