动词填空（用括号内所给动词的适当形式填空。）

1．No country ________（make）such great progress as China in the past thirty years．

2．Usually the thunder ________（hear）after the lightning．

3．You ________（not know）what the pear tastes like if you don't eat it．

4．Shortly after he knew some English，he went on ________（teach）himself French．

5．The little girl will give the flowers to the hero when he ________（appear）．

6．Sometimes clouds are so thick that they do not let much sunshine ________（come）through．

7．In the old days the working people in our country ________（look）down on．

8．The engineer ________（search） for some information on the Internet in the study while his wife was cooking in the kitchen．

9．I don't think Aunt Wu would mind ________（take） care of our children while we're away．

10．The old scientist was awarded a gold medal for what he ________（do）for the development of modern science since the mid-twentieth century．