11.　 夏威夷以它那美丽的海滩而著名。

10.　 　 　 　She decided to buy a digital camera online so that it could be sent to her.

9.　　　 　 　They played carelessly , and they deserved to lose.

8.　　　 　It is necessary to take medicine on time.

7.　　　 　 　 There will be hardly enough space for anybody else.

6.　　　 There are twenty more trees to be planted.

5.　　　 　 　 Most business letters around the world are written in English.

4.　　　 Which of these do you think is the second most useful invention?

3.　　　 　 　If you get a chance to go, take it.

2.　　　 　 　It's our duty to keep our environment clean and tidy.