We will never forget what happened ____ the afternoon of May12, 2008.
He was busy chatting online that he didn’t anything dangerous on the road while walking. As a result, he was knocked down by a car.
_________ the boy student has made marks in his study, he never shows off.
Don’t touch the machine_________ the teacher allows you to.
Classical music has _____ lasting value while folk has _____strong local colour.
— I missed the wonderful football match. — _______. A. No problem B. What a pity C. Not at all