Exercise 1: Chuyển các câu sau sang câu bị động 13. We'll continue to use this phone. This phone ...................................................................................................................................................... 14. Did people make jeans two hundred years ago? Were ? 15. They opened the road 10 years ago. The road .......................................................................................................................................................... 16. We expected them to forgive us. We. ................................................................................................................................................................. 17. You should open the wine 3 hours before you use it. The .................................................................................................................................................................. 18. It's your duty to make tea for the party. You ................................................................................................................................................................. 19. The man gave me a piece of paper with his address on it. I ....................................................................................................................................................................... 20. The teacher is watching them work. They ................................................................................................................................................................