Only when _____ five _____ my father. [ ]

The river smells terrible. People must_____ dirtythings into it.

Haven’t I told you that you should get home earlier—Yes, but I __________ home earlier than I usually do.

Daniel started to play_________ piano when he was________ 11-year-old boy.

e President Hu Jintao paid ________visit to the Shanghai World Expo Park on Thursday, two days ahead of ________­opening of the global event.