---Have you finished your work yet?　---No, not yet. I think it’ll take _____ ten minutes.

The teacher asked the boy many questions, but he only answered ______ of them.

—Are there ____ kites in the picture ?— Yes, there are ____ .

We must try ______ best to make our city more beautiful.

— _________ did you do with old books?— I sent them to children in poor areas.