--Monitor? --- I’m not monitor of our class. I __ with the teacher until the monitor is elected.
--You don't look so well, Mary. What's the matter with you? --Why?___________.
China has hundreds of islands, ___________ is Taiwan Island.
Be quiet!Our teacher has _________ to tell us.
Nearly________ of the surface of our planet is covered by water.
It's said that __________ is going to give us a lecture.