Peter is busy _ _ at school, but he never forgets _ __ exercise every day.A. working; doing B. working; to do C. at work; doing
I have no idea what life would be like without water. The underlined part means “_____ ”.
The lady _____ dancing as a hobby in her sixties, and she is really good at it now.
Though I _____ the phone number many times, the foreigner still couldn’t write down.
Edward, you have grown up. You should learn to make your own room _____ .
These natural disasters have warned us that everyone should start to protect the _____ immediately.