— Micheal, do you know your father wants to buy a piano ? — Oh, I don’t know or not he’ll buy one. He didn’t tell me . A.what B.why C.whether
---David, the weekend is coming. What shall we do? ---_______ go hiking in the countryside?
I want to know you will come back at 8:00 clock tomorrow.
--- Which of these sweaters would you like? --- _____. They are both expensive and out of fashion.
I hope my classmates can come up with a way to _______ the sick boy.
You needn’t worry ____ about your Maths. Work harder and you will do better.