You can stay here , _______ you can leave at once.
The fifth lesson has _________ new words, but it is very difficult for me.
I don’t know if she tomorrow. If she ,let me know.
Last Sunday we didn’t go out __________ the rain.
A: May I go out to play football, Dad?B: No, you ________. You must finish your homework first.
I didn’t know he came back I met him in the street.