—Jim, who taught ________Chinese before you came to school?—Nobody. I learned it by _______.

 We are sure that our football players will do________ best.

We all like ____ math teacher because she is very kind.

When you have borrowed a book from the library, you should keep it well, as if it were ______ of ______.

I find _______ difficult to finish the work on time. We only have three hours left.