If there _____ no buying and selling of animals, there will be no killing in nature.

If you go for a long ride in a friend’s car , it’s the custom to offer to some of the expenses .

Don’t speak_________ , Li Shan. Your sister is doing her homework now.

The two boys are fighting _______ each other.

I’m afraid I won’t be available thenI _____ a friend off at 3:00 this afternoon