3．My sister 　　　(cut) hair when I came to see her．

2．Please ask the children 　　　(not play) in the street．It's dangerous．

1．Our teacher told us that the earth 　　　(travel) around the sun．

8．How 　　　　the boy is! He didn't find his missing pet dog．

C)用括号内所动词的正确形式填空。

7．There are many kids 　　　　basketball in the playground．

6．Japanese companies have already made robots 　　　　like human．

5．That old man makes a 　　　　by selling fruits．

4．We all think Yang Liwei, Nie Haisheng and Fei Junlong are all 　　　　in China．

3．They have done the same work for a long time, so they get 　　　　．

2．They found it difficult to work out the problem by 　　　．