X.Turn these sentences into passive voice. 18. She bought the watch at the shop. → ................................................................................................................................ 19. They built the house in 1950. → ................................................................................................................................ 20. We did the exercises last week. → ................................................................................................................................ 21. The pupils sent the letters the day before yesterday. → ................................................................................................................................ 22. He learned the lesson two weeks ago. → ................................................................................................................................ 23. Nguyen Du wrote Kieu story. → ................................................................................................................................ 24. She made the cake last night. → ................................................................................................................................ 25. Daisy washed the dishes last night. → ................................................................................................................................