How many times do you go to Hong Kong ?

What color is it?–______.

______ it take you to walk from your home to your office?

Have you ever been to Xiangyang?—Yes. It is an ancient beautiful city ______ has more than 2800 years’ history.

Listen! David is talking happily with his mother in the next room.　— It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.