一、单项选择。
1．(导学号：36422000)Don't keep our parents waiting too long.As C children，we are supposed to stay with them as often as possible.(2016，山西百校联考一模)
A．our B．your C．their
2．(导学号：36422001)—A serious traffic accident happened last night.I heard that the driver was a man who had drunk much.
—He C be punished according to the traffic rules.(2016，山西百校联考一模)
A．may B．can't C．must
