What can I do for you, sir?（）

A.Thank you.
B.You can't help me.
C.I want to buy a camera.
D.I'm glad to hear that

A.In a university.
B.Very hard.
C.Mathematics.
D.At nine in the morning

A.I'm planning to go to the cinema with my friend
B.No, I'm not going to do it.
C.Thank you for asking me about it.
D.Yes, I'll go