What’s the matter ______ you ?—I have a bad cold.[ ]
Don’t copy others’ work. If you do it by, you’ll feel much better.
Is Mr. Brown famous ___________ his poems?-Yes, but he isn’t known __________ a great writer like his father.[ ]
My parents are unhappy today I think I shall think of ways to ______.
When he was a student, he would get up early and work late into night, believing “______________”