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1）The problem           （discuss）now is about the improving of the public transportation．

第二組：選擇being done；done；to be done填空

6）If he          （give）time，he will make a very good table tennis player．

5）          （rob）the peddlers（小販）of their money, the teenager-gang ran off in different directions．

4）When           （question）by the police，the murderer confessed all his crimes．

3）When e-shopping          （do）properly, it can save us a lot of time and energy．

2）E-shopping，when properly             （do），can save us a lot of time and energy．

1）If      （elect），the mayor promises that he will spare no effort in improving people’s housing．

第一組：選擇done；is done；having done填空