I have a pet, ______ name is Polly.

Do you know how long ________? —-I’m sorry I don’t know.

Who’s that man in our classroom? It ________ be Mr. Brown. He is much taller.— You mean the man in white? He is an exchange student from England.

“How many students have visited the Summer Palace?”“.”

Shall we call for a taxi?—OK. Let me _______ the phone number in Yellow Pages.