—Why not talk with your parents about your willingness to attend Peking University Summer Camp?—I tried __________to get them to listen to me. 

Graduation is a good time to thank those who have helped you ______ the tough years.

After she considered the problem, she got a tall box to stand ________.

— He said he would arrive _____ six o’clock. But now it’s nearly seven. — Maybe he will arrive _____ a few minutes.

Areas where students have particular difficulty have been treated                   particular care.