Excuse me, where are we going to have our class meeting?—I’m not sure. Ask Li Hua, please. He _________ know.

Here _____ my books. My pen is _____ my pencil case. [ ]

______ is this? Is it a ruler?—Yes, it is a red ruler.

I think it’s very dangerous to drive six hours without a rest.—I agree. Six hours really a very long time.

My mother doesn’t know __________ this morning.