A．set；looked

　　B．set；looking

　　C．setting；looked

　　D．setting；looking

　　2．People are struggling________ pollution.

　　A．for

　　B．against

　　C．to

　　D．on

　　3．It is often said that ________ teachers have ________ very easy life.

　　A．/；/

　　B．/；a

　　C．the；/

　　D．the；a4．—May I open the window to let in some fresh air?

　　—________

　　A．Come on.

　　B．Take care.

　　C．Go ahead!

　　D．Hold on!

　　5．He expanded________ his new theory.

　　A．in

　　B．into

　　C．about

　　D．on

　　6．Susan wanted to be independent from her parents.She tried ________ alone，but she didn’t like it and moved back home.(2011·威海调研)

　　A．living

　　B．to live

　　C．to be living

　　D．having lived

　　7.—You were brave enough to raise objections at the meeting.

　　—Well，now I regret________ that.

　　A．to do

　　B．to be doing

　　C．to have been done

　　D．having done

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