英语题目（说明理由）
第一题I have many important things to do. I____ a little late.
A、maybe B、perhaps C、may be

第二题He often plays sports,_____,running,swimming and ping-pong.
A、for an example B、for examples C、for example

第三题I'm sorry that my mother isn't in_______.
A、for a moment B、a moment ago C、at the moment

第四题 I believe ________ (he)clever.
第五题I won't go to bed until my mother _______ (come) back.
第六题Our life is __________(improve)
第七题There is something wrong with your throat. You'd better________(drink) lots of water.