Sun Yang, a young Chinese swimming talent, ___________several gold medals before 2012 London Olympics

Should I go to the University of Iowa or Iowa State University—Think it over for a few days. You _____ make up your mind right now. There’s no hurry.

________ have left school, for her bike is stillhere.

Mary failed the driving test again．If she ________ harder, she ________ the test easily．

.It was a cold winter night,and there wasn’t anyone _________ the boy could turn to for help in the street.