Each year __________ fishes are killed by the polluted water and many people are made sick by the polluted air .—-So we should do something to stop it .
Listen! Is that Linda singing in the next room?— No, it ________ be her. She is still in Shanghai.
Do you know _______ the girl in red is?—I’m not sure. Maybe a doctor.
Let’s at the school gate.
Kate’s room is not tidy. Her things are_____.