It’s time _____ class. You must _____ the classroom.

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

—Must I buy lunch at school?
—No, you needn’t. You __________ bring your own lunch if you want to.

There's enough time for you to go to the airport.You        hurry now.

---There is somebody knocking at the door. Who________ it be?
---I’m not sure. It ________ be a postman.

—Must I return the book this week?
— No, you ____. You can ____ it for 20 days.

---There is somebody knocking at the door. Who________ it be?
---I’m not sure. It ________ be a postman.

---There is somebody knocking at the door. Who________ it be?
---I’m not sure. It ________ be a postman.

—Must I take the medicine every day?
—No, you _______.
A.must  B.mustn’t    C.needn’t

The book ________ be Tom’s. Look! His name is on it.