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．

　　Have you heard of the term“etiquette” And do you know that etiquette is not only a useful word 　　1　　 very useful to understand? Etiquette is not the same in every culture 　　2　　 in every situation．For example, standing very close to the person you are talking with is quite common in some Asian countries．However; if you do this in Europe, some 　　3　　 people might feel 　　4　　．Even in China, we all know that etiquette is not the same in all situations．Perhaps we think that talking loudly in our own homes is fine, but there are other places where talking loudly is 　　5　　．For example, most people would agree that talking loudly in a library, a museum, or a movie theater is 　　6　　．Even if you are with your friends, it is better to keep your voice 　　7　　 in public places．In fact, we should also 　　8　　 not to cough or sneeze loudly in public．

　　If we see someone 　　9　　 the rules of etiquette, we may politely give them some suggestions．Perhaps one of the most polite ways 　　10　　 ask someone, Would you mind doing this or Would yo mind not doing that．For example, if someone cuts 　　11　　 you in a line, you could ask them, Sorry, would you mind 　　12　　 the line? If someone is smoking on the busm you could ask, Excuse me, could you please 　　13　　 that cigarette? People don't usually like 　　14　　, so we have to be careful how we do this．

　　Although rules of etiquette can often be different, some rules are the same almost everywhere in the world! For example, 　　15　　 is almost never allowed．If you see someone you know doing this, you can ask them, Would you mind picking it up?

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　　I can't remember when I started collecting litter.But it was when I got tired of 1 　 litter nearby and realized that 2 　 was going to pick it up.

　　I live near a 3 　 in Enshi,Hubei Province.I can walk there in three 4 ndline!I 5 　 love going there to play with my dog.But one day there was so much litter there that I became very unhappy.I decided I had to clean up the forest.I wanted to 6 　 happy going there again.

　　I made my 7 　 trip to clean the forest that afternoon.I took a big black rubbish bag with me.Ten minutes 8 　 starting to pick up litter,my bag was full!It had cans,bottles,broken glass and newspapers in it.From then on,I went to the forest four times a year to pick up the litter.I often 9 　 there for three hours.It makes me feel 10 　 to do something for the environment.

　　After each trip,I 11 　 all the litter that I've found.If 12 　 of it is recyclable(可回收的),I keep it.I can't 13 　 why people drop litter.But I will keep picking it 14 　 they stop dropping it.I know I am only doing a small bit to help 15 ndline,but I still think it is important.

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