It is thought that one billion people in the world,_____ is half the world’s workers, earn their living by farming.

Fred doesn’t eat any vinegar because he thinks it’s __________.

Which of the caps will you take?—I’ll take _______,one for my father ,the other for my brother.

I don’t think we can find a new day to work out the problem. — But we’d better not .

My son want a pet rabbit for long, but I have no time to buy ______ for him.