Use The Correct Prepositions:
On At In

a) Peter gets to work ___ 9 am.

b) My classes start __ Monday.

c) Will you have vacations ____ July?

d) She was born ___ April 12th

e) My sister usually arrives at home ___ 7 pm.

f) It's cold ___ night.

g) I’ll celebrate my birthday ___ Saturday ___ Curitiba ​