It’s Sunday tomorrow, so you _______ get up so early.

---Must I be back home before 6 o’clock?
---No, you ____. But don’t be too late.

---I think Miss Gao must be in the library. She said she would go there.
---No, she ___________ be there. I have just been there.

—May I         this pair of blue jeans? —Yes, you        .

—Is the woman over there Miss White?
—It ______ be her. She’s gone to Hangzhou.

---Look. The man at the gate _____ be our headmaster. He is always standing there every morning.
---No. it ____ be him. He is having a meeting in the office now.

They can hardly move at all, _____________?

Jack _______ swim when he was five years old.

— Must they clean and tidy the classroom now?
— No, they      . It       after school in the afternoon.

—Excuse me, can you tell me the way to the zoo? 
—Sorry, I’m new here. Please ask that policeman. He ______ know.
A. can       B. need    C. may