—I hear you run for half an hour every day. —Right, we have to. It is one of the ______ in our school.

—What has ________ done since 1989?. —It has built many schools for poor children .

Can you tell us how important wildlife ___ is?

 —Mum, 1 am hungry. May 1 have some______?—Of course. But don't eat too much.

 If you want to be a ______, you should study math hard.