This pair of shoes ______ Li Gang’s ,It’s too big for him .

 -----Did you ask Sophia for help?-----I _____ need to----I managed perfectly well on my own.

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

According to the school rules, no student _______ go out of school without the permission of the teachers.

—A shy boy like John ________ give up a secure job and start his own business!—Yes，nobody had expected that.