What do you think of haze(雾霾)? —- It ____ us we all must try to do something to stop the air pollution.
Stress is everywhere and everybody has to _____face it.Actually stress isn’t as bad as it .
What is your mother doing?—She ___ for oranges.
The room was dark,_________ I turned on the lights.
I think Miss Lin must be in the library. She said she would go there.—No, she __________be there. I have just been there.