I. Fill in each blank with the correct preposition. 1. The price of electricity is going up in_____ 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 oclock and then went home. 10. I cant remember exactly when the accident happened. I think it was _____ nine and half past nine. 11. Are you acquainted _____ the lady? 12. _____ the children left, the house was very quiet. 13. These photographs were taken _____ a friend of mine. 14. The river Rhine flows _____ the North sea. 15. I shall meet you _____ the corner _____ the street. 16. I always come _____ school _____ foot. 17. He had learned the whole poem _____ heart. 18. He has waited _____ her for a long time. 19. Hes not very keen _____ watching football, but his wife is. 20. Are you worried _____ the final examination? giúp mình với ạ mình cảm ơn