He helps his friends _______ their English.A. in B. at C. with
— You can’t imagine ________ great fun playing computer games is. — Really? But it may cause you a lot of trouble.
— There is somebody at the door. ________ it be Tom?— No, it _______ be him. It’s just six o’clock. It’s too early.
— Did you find the small village yesterday? — Yes, without any difficulty, for it has ______ changed over years.
Many Chinese students think science subjects are _______ foreign languages.
Money is very important, ________ it is not the most important thing.