---I want someone to write the composition for me. --- No. As a student,  you ____depend on yourself.

—Are you going to help him?—Why  ___ I help him? He' s never done anything for me．

—Where did you get The Frog written by Mo Yan?—I picked it up from a bookshop online if you ________ know.

--We need a man full of wisdom to take charge of the project.--________ the young man graduating from Harvard have a try?

—Who’s that over there, Is it Jane?—No, It ________ be Jane. She is ill in hospital today.