几道高中英语题,求详细解释

题目

几道高中英语题,求详细解释
①Dr.Zhong was chosen to _____our hospital at the internationgal meeting
A.represent B.stand for C.instead of D.take the place of
②There is nothing unusual.All_____going well.
A.has B.is C.have D.are
③He_____the story to be false.Which of the following is WRONG?
A.declared B.regarded C.considered D.believed
④Many people agree that______knowledge of English is a must in_____international trade
A.a;/ B.the;an C.the;the D./;the
⑤At the beginning of class,the noise of desks____could be heard outside the classroom.
A.opened and closed B.to be opened and closed
C.being opened and closed D.to open and close
⑥Having_____no-meat day would be a good wayof encouraging______low-carbon lifestyle.
A.a;the B.a/a C.the;the D.the;a
⑦—Will you go to the party tomorrow,Lily?
—No,____I was invited to.
⑧With all the problems______,

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