Completa las siguientes oraciones con la preposición adecuada.
1 Their wedding is ____ August.
2 She was born ____ 1985.
3 This bar is closed ____ the morning.
4 The bell rings ____ 7 o'clock every morning.
5 She learned to surf ____ the age of 12.
6 Banks don't open ____ Sundays.
7 She's getting married ____ January 2014.
8 Her mother must know that she is ____ risk.
9 It was eleven o'clock ___ night.
10 How does the personality trait develop ____ humans?