He must _____ his sister with her math.
Mr White, the principal, has made a great _________ to the growth of the school.
——Where is Tom? We can’t find him anywhere. ——Perhaps he_____home.
——How often do I need to feed the dog? ——It___food everyday, or it will be hungry.
——How heavily it is raining! ——What a pity!We have to_____our sports meeting.
——Why are you walking so quickly, Edward? ——There_____a talent show in ten minutes.