We should let the old people____the bus first when we wait for the bus.
A.to get on B.got on C.get on D.getting on
坚持你的梦想,也许有一天就会梦想成真.
_____ _____to your dream,maybe it will come ture some day.
Mr.Black finished the work _____.
A.hours ago B.for hours C.since 5:00p.m.D.since hours