---Will you please stay here for the party?---Sorry, I _____. I have to go to visit my grandfather in hospital.
He goes to school early on workdays ____ Saturday and Sunday.
Lisa was supposed her homework before nine o'clock. But she couldn't.
Does her friend math?
Last year I was often ill, but now I am good health.
It is foggy(多雾的) today. The plane can't .