从方框中选择合适的词或短语,并用其正确形式完成短文.

pleasant, collect, protect, some, take care of, try one's best, as soon as, cut down, pick up, visit

One day I 1._______ one of my friends in a big town. Suddenly, a piece of beautiful music came to my
ears. My friend's father quickly 2._______ some bags of litter and went outside. I asked my friend, "What's going on?" My friend said that there was a truck 3._______ litter outside.
"Whenever someone throws some litter in, it gives out beautiful music.
4._______ other people hear it, they'll go out with their litter and throw it in."
"It's a 5._______ way to help keep our city clean," said my friend.
6._______ our environment is very important. Wherever you live, you can do something around your
neighbourhood.
Have you ever thrown 7._______ litter onto the ground? Have you ever drawn pictures on public
walls?   Have you ever spat in public? Have you ever 8. _______ trees? If your answers are "No", it
means that you have already helped 9. ________ our environment.
It is our duty to keep our environment clean and tidy. If everyone 10._______ to protect the environment,
the world will become much more beautiful.

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