— Hi, Mary. Any idea where Bill is?— He ______ in the library. I saw him reading books there just now.
Henry,____ Mary and Tom, is coming to China for a visit. Which is wrong?
____ the students likes the paintings. Which is wrong?
Something must be done to prevent our city ____ by thick smoke.
To tell you the truth, I have nothing to do ____ it.
Did you have any trouble ____ the post office?