I feel bored with working all day. —Why not some sports to relax yourself?

Do you know where Mr Brown is?—He _______ Beijing for two days.

Someone is knocking at the door.- It ______ be Tom. He is still in the school.

I made a promiseanyone set me free I would make him rich.

Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall.