将以下句子改为被动语态

如题所述

7 In order to stop air pollution, a lot of measurs have been taken by the government.
8. How to spend the summer holidays is being discussed by us now.
9 He was seen by me to get on the bus .
10 . A computer was bought for her by her mother .
11 The boys were seen by me playing basketball on the playground.
12 The work can be completed by them in two hours.
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