用所给代词的正确形式填空。
1. These are _______ (he) brothers.
2. That is ________ (she) sister.
3. Lily is ________ (Lucy) sister.
4. Tom, this is _______ (me) cousin, Mary.
5. Now _____________ (her parent) are in America.
6. Those ___________ (child) are ______ (I) father’s students.
7. Do you know _______ (it) name?
8. Mike and Tom __________ (be) friends.
9. Thanks for helping ________ (I).
10. ________ (Ann安) mother is ________ (we) teacher.