when people are in great d _____ their brains often work very quickly.Don't be s______ in class.Try your best to answer teacher's questions .
问题描述：
when people are in great d _____ their brains often work very quickly.
Don't be s______ in class.Try your best to answer teacher's questions .
答
when people are in great d emand_____ their brains often work very quickly.
Don't be silent_____ in class. Try your best to answer teacher's questions .
答
danger silent