02br 02br 00Technically you would say02br 02br 00(a) At the end of the contest, prizes were given to the three best drawings in each category. 02br 02br 00Observe that you are saying "were given" so it should be "consisted", both with past tense. 02br 02br 00"In the end of the contest" is wrong because we say "At the end of 01i 00some event02i 00".
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