Nowadays some protective parents want to their kids from every kind of danger, real or imagined.
Wang Wei had served ______a volunteer for three years before he graduated from college .
The little boy ,out of curiosity ,_______the toy to see how it worked ,but couldn’t put it together .
They have always treated us with open hands and we must be generous _______.
The chief editor expressed his doubt _______senior people would enjoy reading such magazines .
As your instructor advised ,you ought to spend your time on something ______researching into .