I. Fill in each blank with the correct preposition.
1. The price of electricity is going up _____ August.
2. They came to visit us _____ my birthday.
3. Did you have a good time _____ Christmas?
4. The children are really excited _____ their summer vacation.
5. We were very disappointed _____ the organization of the festival.
6. John missed a lot of lessons. He was ill _____ January to March.
7. Helen had said goodbye to everybody in the class _____ she left for the hometown.
8. My cat is very fond _____ fish.
9. I waited _____ 10 o’clock and then went home.
10. I can’t remember exactly when the accident happened. I think it was _____ nine and half past nine.