老师让你擦黑板,你应该说 .A.All right. B.Oh no. C.No ,he didn’t.
It's very difficult, _______ I can do it myself.
Are you going toplay Ping-Pong _______ football?
The boy is sitting_______her father and mother.
It's a quarter_______six. Let's go home.
What's the matter_______ you, Linda?