阅读下面短文，从短文后所给的四个选项中，选出可填入空白处的最佳选项．

　　One day I was visiting one of my friends in a big town． Suddenly 　　1　　 beautiful music came to my ears． My friend’s father quickly picked up　　 2　　 and went outside． I asked my friend，“　　 3　　 ？”My friend said that there was a truck　　 4　　 rubbish outside．

　　“ 　　5　　 someone throws in some rubbish，it gives out beautiful music． 　　6　　 other people hear it，they go out with their rubbish and 　　7　　”

　　“It is a　　 8　　 way to help keep our city clean．”said my friend．

　　　　9　　 our environment(环境) is very important． Wherever you　　 10　　 ，you can do something around your neighborhood．

　　Have you ever thrown any litter onto the ground? Have you ever draw pictures on　　 11　　 ? Have you ever spat　　 12　　 a public place? Have you ever cut down trees? If your answers are “　　 13　　 ”，it means that you have already helped protect our environment．

It is our duty to keep our environment　　 14　　 ． 　　15　　 everyone tries his best to protect(保护) the environment，the world will become much more beautiful．

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　　Today computer is more and more(越来越)important 　　1　　 us．Is 　　2　　 a computer in your home? What do you usually 　　3　　 on the computer? Do you often write your homework on it? Do you often 　　4　　 games on it? Some people like 　　5　　 the music．Some people get 　　6　　 for their work on the Internet．Some visit websites 　　7　　 the weekend．Some send emails 　　8　　 their friends．And in some school, teachers use computer 　　9　　．It seldom makes mistakes(犯错误)．The computer is very 　　10　　．

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　　Most students like 　　1　　 computers．It is very 　　2　　．By 　　3　　 computers, they can learn a lot and know many things about their country and the 　　4　　．Of course, they 　　5　　 learn over(通过)the radio．But they like to use computers better．Why? 　　6　　 they can hear and watch at the same time．But they can't see anything over the radio．

　　Computer helps to open students' eyes．And it can open their minds(智力), too．They know the world better．

　　Many students go online only 　　7　　 the weekend．They are always busy with their 　　8　　．But a few students 　　9　　 online every night．They go to bed very late．They can't have a good rest．That's bad 　　10　　 them．

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