What’s this _____? －It’s a hat.[ ]

It is useless book to children. Put it into left drawer and never read it.

Your teacher will be unhappy if you______to school late.

I haven’t got a camera.——I think you should buy_______. It’s useful for you.

.Many scientists believe that now we can study the behavior of a three-year-old child to see ____ they will grow up to be criminals.