---Let’s visit the old people’s house.  ---______ my mother asks me to do homework at home? 

 —Is that your model plane? — No, it's his,            is on the sofa.

—Who is the boy over there?—It’s ______ brother.

中华人民共和国的英文缩写是______.

I find        difficult for Tom to reach that picture.He is a little short.