We should do ____ to stop sandstorms(沙尘暴)from happening again and again.
The earthquake ______ when I _______some cleaning.
I hope you _______ me before you _________ to school.
-Some people kill tigers and make medicine _____ their bones.-Yes, it’s terrible, and we can’t wear clothes _________ animal fur.
-I’m sorry I ______ my exercise book at home.-Don’t forget _______ it to school tomorrow, please.
—Boys and girls, we will have a class trip to Taixing Park next week.—Great! It must be ______. I simply can’t wait _____ it.