题目内容：

用括号内所给单词适当形式填空

1.Lily and Lucy are American girls, but__    __(they)mother is Chinese.

2.Mike and Helen are my         (cousin).

3.How many __       __(policeman) are there in the police station?

4.Who          (be) the boy and the girl in front of Tom？

5.— Are         (this) your grandparents? — No, they aren’t.