We have to start at 7:15 tomorrow morning, we will be late for the 9:40 plane.
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.