Bonjour vous pouvez m'aider moi svp

Complète avec la bonne préposition :
a. I play football ......... Wednesdays.
c. Columbus discovered America ......... 1492.
e. Winter starts .....
.... December.
b. The party is ........... July 14th.
d. My appointment at the dentist's is ....... 14th.
F. My birthday is .............. Monday.​