— Must we send our plan this week?— No, you ______.

All of us must do_______ to help protect the environment，or we will have more hazy weather雾霾天气.                                    

--- Shall I get one more cake fro you, David?--- Thanks, but you ______. I’ve had enough.

—Look at the sign. You_____ fish here.—Sorry, I didn’t know.

-Mr. Zhou, _____ the Iphone belong to Alice?-I’m afraid not. It may be John’s, but I’m not sure.