I’d like to help the homeless people in the earthquake. －You ________ join a volunteer group.

Halfway up the mountain we stopped to ______________.

Dad, will you buy me a new bike? –I don’t know. I’ll have to _________ it.

What’s your favourite fruit?—Apples. You know, _______ apple a day keeps the doctor away.

Be quiet, the head teacher Mr. Gu is coming.— Don’t worry. It _____ be him. Mr. Gu is much fatter.