---This is my sister Ann. ---Is _____ a student?

Please ask ___________. He may know which one is __________.

Mary needs ________help. Let’s go and help_________.

—Jim, who taught ________Chinese before you came to school?—Nobody. I learned it by _______.

——Do you know the man wearing a pair of glasses?-------Yes.He’s a teacher of _________.He teaches _________history.