Where’s your pen?—It’s _____my pencil case.[ ]

About _______of the engineers in my company seem to be in their _________．

Are you going to the library this afternoon, Kate? — Yes, I have to. I ________ READER for two weeks.

Is your math book on the desk, Tommy?—No, it isn’t. It’s _______.[ ]

_______ all these people have in common is ________ they have succeeded.