50． In my opinion, keeping dogs well ________ up is advisable for dog owners.

　　A．to tie

　　B．being tied

　　C．tied

　　D．to be tied

　　51． ________ for a whole night, we still couldn't agree on when to start and where to go for the holiday.

　　A．Discussed

　　B．Having discussed

　　C．Discussing

　　D．Being discussed

　　52．Every morning Jack's wife will stand before the mirror, ________ carefully until she has to go to work.

　　A．dressed

　　B．dressing

　　C．to dress

　　D．having dressed

　　53． Our waste recycling project ________ a lot of investigation and paperwork had been done by the end of last term.

　　A．involved

　　B．to involve

　　C．being involved

　　D．involving

　　答案：D　考查非谓语动词。句意为：我们的废物回收利用工程包括很多调查和文书工作已经在上学期末完成了。involve“包含，包括”，与主语“project”是主动关系，所以用现在分词involving作定语。故答案选D。

　　54． During the flood many students volunteered ________ through the weekend, giving out food and water for the victims.

　　A．working

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