You ___ drink wine before driving, or the police will take your license away.

--- Listen! David is talking happily with his mother in the next room.　--- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.

 Martin hasn't got in touch with me for ages. He ________ my new cell phone number.

---The work will take me another week. I’m really tired.---I think you          as well consult an experienced worker.

My sister met him at Ningbo Grand Theatre yesterday afternoon, so he         your lecture.