______ does he want so much money— Because he wants to buy a new camera.

Is Ms．Black a good teacher –I think so．She is ________ us．

The reason ____ the people in the mainland go to Hong Kong to buy formula is that people are not convinced ____the safety of formula produced in the mainland.

I have bought some books recently, but ________ interests my father.

Why not_____to see the horror film tonight since you don’t mind_______