Fill in the blanks with( at, on, in )where necessary 1)----- 3 o'clock 2) ----- the weekend 3) ---- 30 th October, 2000 4)---- my sister's birthday 5)---- the morning 6)---- last night 7)---- dinner time 8)---- this winter 9) ---- tomorrow evening 10)---- Sunday evening 11)----- Independence Day 12)---- middy 13)---- every year 14)---- next Saturday 15)---- summer 16)---- August 17)----- next month 18)---- holidays 19)---- 2008 20)----- weekdays