---A number of students _________ in the dining hall.---Yes, the number of the students ______ 800.
He goes to work early on workdays _________ Saturday and Sunday.
There will be trees and pollution in the future.
——I don’t know if she __________ tomorrow.—— If she _________ tomorrow, I’ll call you.
My mother when I got home yesterday.
It’s already half past seven. You ________ get up quickly.