Peter is busy _ _ at school, but he never forgets _ __ exercise every day.A. working; doing B. working; to do C. at work; doing
We should _______ the school rules as students.
Bob came to China with her mother __________ the third time in 2008.
Don’t shout at him. He _______.
Don’t worry. I’m sure ________ there on time.
—When did your school hold the sports meet? —Last week. And I _______ the girls’ 400-metre race.