Mum, my friends are waiting for me outside. May I go out to play with them?— Yes, you , but be careful, please.

How often do you clean your classroom? —_________．

Boy, you _______ lean (伸) out of the window while the bus is running. That’s dangerous.—Sorry, I won’t do that again.

What do you think of Black Coal, Thin Ice?–It’s a good film., it is not suitable for teenagers.

I mean ______ class meeting on Monday afternoon.