— May I ask you some questions? — ______________ A. Yes, he may. B. Sure, go ahead. C. Of course not.
You must concentrate _____ your study not on your clothes.
There are so many beautiful clothes in the store. I really don’t know _____.
We all know the _____ of learning English well.
The room must _____ up right now. It’s too dirty.
, the rain stopped when we went out for a walk.