A 3G mobile phone, ______to be most useful and fashionable, is popular with some teenagers.
—I wonder whom you are waiting for. —The policeman _______ the traffic accident.
Jobs are hard to get and, _______, more young people are continuing their education.
—Tony, come down and help me with the heavy box! — Come on! I _______ all day long.Get Peter to do that!
— I saw Mr Li at the meeting yesterday. — Did you? He _______ have attended it, for he had asked for sick leave.
— When did the couple die? — It was on May 12the earthquake hit WenChuan County.