Look! A book is on the floor. Whose is it?—It ______ be Rick’s. It has his name on it.

They look so tired.–Yeah. They _____________ day and night. So they are all in poor health.

This isn’t _____book.________is on the desk.

What’s the matter ________ your sister? —She has a________ cold.

I can’t findbackpack. Can you help?