How do you improve your listening, Mary? —Just ______ listening to tapes, it’s a good way, you know. [ ]

Could you tell me __________ my English?—By listening and speaking more.

The water in the river nearby will be dirtier than before if nothing __________.

Peter can play _______ volleyball. What about you?—I can play _______ drums.

The mountain was_____ steep (陡峭的) _____ few people in our city reached the top.[ ]