Sorry，Cathy，I didn’t know that you were badly short of money then.But you ________ me for help.

 .Susan’s parents have bought a large house with a swimming pool. It ______be very expensive.

—_______ do you clean your room?— Every day. 

— Peter was admitted to a second－class college.— He ________ a top university, but he was addicted to playing computer games.

---Look!It _______ be Mr Zhang . ---No,it _______ be Mr Zhang. He has gone to Paris .