Play, often ______ as an activity for younger children, is still important in the social development of teenagers.
—Have you seen ________ pen?I left it here this morning. —Is it ________ black one?I found it in the corner.
Keeping a diary is ________ good habit,by which you'll make ________ great progress in writing.
I don't know who invented ________ iphone,but I think it is ________ useful invention.
—Which of the twin brothers is easier to get on with? —________ younger one.He is ________ most humorous man.
It is said that ________ wool produced in Australia is of ________ high quality.