1 . 用定语从句合并
There will be 20 competitors to recite 40 poems in the competition.
The competition of course can broaden our horizon and enrich our knowledge.

2 . Some teenagers had plastic surgery and it stopped them from returning to a normal life. (用定语从句改写)

3 . I hope you can have a healthy eating habit. It is more beneficial to your future life and study.(用非限制性定语从句合并句子)

4 . They search for cultural relics and take photos of them.They will show the photos to the public to arouse their awareness of heritage preservation as well as gain their support. (用非限制性定语从句合并)
→They search for cultural relics and take photos of them, __________.

5 . Try to do something for your mother and it will make her happy.(用非限制性定语从句改写)

6 . 我们可以在网上得到有用的信息，这使我们的学习受益。
(一般表达)We can get the useful information and it benefits our study on the Internet.
(高级表达)　 _______________________________________________   (用which引导非限制性定语从句升级)

7 . That year, she not only won the silver medal in the Australian Open but also won the gold medal in the French Open. They are both world-class tournaments. (改为定语从句)
That year, she not only won the silver medal in the Australian Open but also won the gold medal in the French Open, _________ are both world-class tournaments.

9 . Some misunderstanding arose between me and my best friend. That made me quite upset.(句型转换)
(1)Some misunderstanding arose between me and my best friend，________ .(用定语从句改写)
(2)________. (用what引导的主语从句和that引导的表语从句改写)

10 . On July 7, I took a bus to Leshan. Leshan is famous for the Giant Stone Buddha.(用非限制性定语从句改)