Mike is _____ eight-year-old boy. But he plays_____ guitar very well.

I’m too busy. Could you do_______ to help me?—Of course. I can do_______ for you if you want me to.

________is the coat? – It’s 30 yuan.[ ]

They have built another new library for the students—About_____ of the books in their library are written in English．

There is ____ “u” and _____ “r” in the word “number”.