--- I don’t know ______ my telephone number.--- Through a friend of mine.
—What are you going to do this afternoon,Andy?—My hair is too long.I want to get my hair________.
I failed in the final exams last term and only then________the importance of study.
It’s important for teenagers________time with friends.
Mr Li is very strict________his students and he is also strict________his work.
—I think the poor health will get________of your study.