--_________ I finish my homework now,mum?
--No,you _______.But you must finish it before seven o’clock.

– Listen ! Is Professor Johnson giving a report in the hall?
– No, it _______ be him. He has gone to America.

---Who is making much noise?
---It ____ be Timmy. He is sleeping now.

--English is very important.  You        learn it well.
A. ought to
B.  needn’t
C. can’t

---How nice that Lucy has been invited to the party too!
---Well, she _________ not come. She is not sure whether her mother will allow her to.

If you _______ go, at least wait until the rain stops.

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

-Must I finish the work today?-No, you ____. You can finish it tomorrow.

---Are you going to Shanghai by plane ?
--- It’s fast , but expensive. So I’m not sure. I____ take a train

The woman you saw at the park ________ be Jane. She is at work now.