1 The subject here is the percentage returned, not the questionnaires = singular verb required 2: Is there more than one firm involved? Or is only one involved = firms' OR firm's 3 you have identified the error correctly, and introduced a new one - president is here a title, so should be capitalized 4 OK 5 OK 6 OK 7 OK 8 I would question the commas in this one, and leave the capital letters alone 9 OK 10 OK
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