--- Do you know the boy________ is sitting next to Peter?--- Yes. He is Peter’s friend. They are celebrating his ________ birthday.
Bad habits will get _____ the way of your life.
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.