? Do you know the most ancient city in China ─ Xi’an well? ? No, this is the first time I ___________ here.

Shall we go out for a walk?—Sorry, I can’t. I _______ my homework.

What are you going to do this Sunday? –I _____yet.

I got an e-mail this morning. It was my foreign friend, Tony.[ ]

There are many flowers and trees on ______sides of the Century Road.