I have done this grammar exercise. My score is 60%. There are some mistake that I made below:
http://elc.polyu.edu.hk/cill/eap/2004/u6/pg135ex2modals.htm
1)Judging from the attitude and examples used, this article might have been (was) written by a democrat.
2)It might be (is) wise to spend more time working out our needs before conducting the survey.
3)The audience might not have been (was not) aware of the mistake we made during the performance.
4)Our formula can be (is) taken as a new measure to evaluate the existing models.
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