1、 ( ) from other continents for millions of years, Australia has many plants and animals not found in any other country in the world

2、 When ( ) help, one often says "Thank you" or "It'skind of you"

3、 ( ) the safety of gas, the government has checked the city's gas supply system.

4、 The old man, ( ) abroad for twenty years, is on the way back to his motherland.

5、 Anyone ,once ( ) positive for H7N9 flu virus,will receive free medical treatment from our government.

6、 I got to the office earlier that day, ( ) the 7:30 train from Paddington.

7、 While watching television, ( ).

8、 ( ) scores of times, but he still couldn't understand it.

9、 English has a large vocabulary, hasn't it? Yes, ( ) more words and expressions and you will find it easier to read and communicate.

10、 ( ) the general state of his health, it may take him a while to recover from the operation.

11、 So many directors ( ), the board meeting had to be put off.

12、 ( ) what you are doing today important, because you are trading a day of your life for it.

13、 Lots of rescue workers were working around the clock, ( ) supplies to Yushu,Qinghai Province after the earthquake.

14、 I found my computer functioning much better, ( ) a new operating system.

15、 The murderer was brought in, with his hands ( ) behind his back.