Peter is busy _ _ at school, but he never forgets _ __ exercise every day.A. working; doing B. working; to do C. at work; doing
.He was the only person _______was invited to the party.
–Do you know________ , Mike ? --On May 12th , 2008 .
–Would you please tell me ________ next ? --Think it over . You’ll find a good way .
There are some _______between _______ languages . So they are used ________.
My good friend is leaving for his hometown . I’m going to ________ .