Do you know the young boy________ is reciting a Tang poem over there? — Yes. He’s a friend of________ .

It’s hard to keep the house with three kids.

About____________of the books in the library are written in Chinese.

Is that man Mr Hu?—That ______ be Mr Hu. Because he has gone to Japan with his wife.

Jack’s mother was twenty-seven when he was born. Jack is eleven this year. How old is his mother?