Exercise 1: Rewrite the following sentences using participles ( Ved, Ving)  and to infinitives( To V) .

( Viết lại các câu sử dụng ( Ved, Ving)  and to infinitives( To V) để rút gọn mệnh đề quan hệ

11. John was the last man who reached the top of the mountain.

12. The last person who leaves the room must turn off the light.

13. The experiment which was conducted at the University of Chicago was successful.

14. They work in a hospital which was sponsored by the government.

15. This is the second person who was killed in that way.

16. The first person who catches the ball will be the winner.

17. I don’t like people who arrive late.

18. I live in a house which was built a century ago.

19. The people who work here are very interesting.

20. The handkerchief  which was embroidered  by my sister was really beautiful.