–Don’t step on the grass next time, Mike.--________A. Is that so? B. Don’t worry. C. Sorry, I won’t.
"The volleyball must belong to Mary" means_________
My grandpa is _________ weak ______ look after himself.He needs help.
When they heard the ___________ news,they got very ___________.
I don't know _______.Can you tell me________?
----How do you improve your listening skill, Mary? ----I often do it _______ tapes and English radios.