1) ... Saturday a) in b) on c) at 2) ... July a) at b) in c) on 3) 2000 a) in b) on c) at 4) ... holidays a) at b) on c) in 5) . . . Friday a) in b) on c) at 6) . . . summer a) in b) at c) on 7) ... the morning a) in b) on c) at 8) ... the 1st of September a) in b) on c) at 9) ... the 7th of January a) in b) on c) at 10) ... Thursday afternoon a) at b) on c) in 11) ... the evening a) in b) on c) at 12) ... the 21st century a) on b) in c) at 13) ... the weekend a) at b) in c) on 14) ... midnight a) in b) at c) on 15) ... winter a) in b) on c) at 16) ... noon a) in b) at c) on 17) ... Wednesday evening a) at b) on c) in 18) Christmas a) on b) at c) in 19) ...Easter Day a) at b) in c) on

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