He seldom listens to others. He＿＿＿＿＿answer for what he has done. 

Peter ____ come with us tonight , but he is not very sure yet . 

—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?—____ my students have a try?

---Must I fill in the form?   --No, _______.

---- Where will you start your work after graduation, in the south or in the north? ---- Mm, it’s not been decided yet. I _____ continue my study for a higher degree.