1) Saturday a) in b) at c) on 2) summer a) in b) at c) on 3) the twenty-first century a) in b) at c) on 4) eight o'clock a) in b) at c) on 5) the 12th of March a) in b) at c) on 6) June a) in b) at c) on 7) Monday morning a) in b) at c) on 8) 2010 a) in b) at c) on 9) my birthday a) in b) at c) on 10) the 1980s a) in b) at c) on 11) the weekend a) in b) at c) on 12) the afternoon a) in b) at c) on

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