16. A。根据最后一段“‘Police Dad’ can now keep watch wherever a child is.”可知，当孩子们出去的时候，Liao想知道他们在哪。

　　17. B。根据上文“Liao saw a child GPS watch on TV and immediately got the idea to let children wear the watches so he could ensure their safety.”可知，这种高科技的发明能够避免一些悲剧的发生。

　　18. D。根据最后一段“Those children who get watches are very delighted”可知，Liao为孩子们购买定位手表。

　　19. C。Liao Yifeng的愿望是让每个孩子都安全。

　　20. A。根据上文“Those children ... often phone me.”可知，接到他们的电话，Liao很高兴。

　　第2期How to Write参考范文

　　Recently, the educational department managed to encourage teenagers to learn on the Internet, which suggests that all the school students should take part in the activity.

　　As far as I’m concerned, it is good for us to learn on the Internet, which can help us get along well with our study in a convenient way. Besides, we can make full use of the resources offered on the Internet to improve our personal qualities.

　　However, the government should make advanced technology available to every student in our country, which is sure to help more children to learn on the Internet.

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