用介词填空：

用适当的词填空：

“Shall I come and talk it over with you before class or after class?”

“________, Better come tomorrow.”

用适当的词填空：

用适当的词填空：

用适当的词填空：

用适当的词填空：

----What's this?

----It's a red flag ______ five stars.

The big tree had been there for fifty years _______ I was born.

Tom and I are good friends. We always love and help ______.

用恰当的词填空，完成状语从句。

He knows quite a lot ______ he is young.