Mary does well ____English ____listening to the English program.A.in,on B.at by C.in by
____ of the boys in Class 4 are playing games.
I don’t know when he______ tomorrow .When he_____ , I’ll let you know.
Tom likes playing _____volleyball, and his sister likes playing______ piano.
The meat smells _____. You’d better throw it away.
---Do you mind my taking this seat? ---______.