-_____ do you have P.E? -We have it on Wednesday and Friday.
---Don't skate on the lake! ---Why not? Isn't it thick enough___________?
—The shoes don’t fit me. Would you please show me ______? —Sure. Here you are.
Mother returned home _____earlier than Father that evening.
The policeman told the children _____play in the street.
Mary will arrive Nanjing the morning of July 5 by plane.