The new online library makes possible for students to choose books by smart phone off campus．
A．it B．one C．that D．this
We were delayed at the airport．Otherwise，we here by lunch．
A．must have been B．could be
C．should be D．would have been
According to the latest study，most traffic accidents be prevented if drivers are careful enough．
A．must B．can C．have to D．need
He never complains about the difficulties he has in life． ，he always has ways to overcome them．
A．However B．Otherwise C．Instead D．Therefore
Jimmy managed to make a(n) profit out of the deal，for he had got such a good opportunity．
A．handsome B．pretty C．attractive D．beautiful
We all goodbye to my father as he was on the train to Beijing．
A．made B．shook C．Paid D．waved
