The number of chairs in the room __ ten. I’m afraid a number of chairs in the room ___ lost.
At present, the students in China take more exercise. Most of them are ______ than before.
—What a beautiful key ring! __________is it? —Only 5 yuan.
Jack will have a math test this afternoon. He needs a__________.
You are old enough to make decisions by __________.
There is __________backpack on the desk. It belongs to Tom.