About 15 years ago I started seeing a lot of __20__， like toilet paper, beer cans, and empty boxes, around the area. It's __21__ me why visitors started respecting the place __22__ and treated such a beautiful home­like place this way.

　　I tried __23__ trash (垃圾) myself, but the job was too big. I would __24__ an hour or two on the job, only to find the area trashed all over again weeks later. Finally, I got so __25__ it that I decided something had to change.

　　As a rock­climbing guide, I knew __26__ about organizing any big event. But in 2004，together with some climbers, I set a date for a __27__. On that day，more than 300 people __28__. Over three days we collected about 6,000 pounds of trash. It was amazing how much we were able to __29__. I couldn't believe the __30__ we made—the park looked clean!

　　Each year volunteers come for the cleanup from everywhere. In 2007 alone, 2,945 people picked up 42,330 pounds of trash and __31__ 132 miles of roadway.

　　I often hear people __32__ about their surroundings. If you are one of them, I would say the only way to change things is by __33__ rather than complaining. We need to teach by __34__. You can't blame others __35__ you start with yourself.

　　16．A.distantB．hugeC．narrowD．loose

　　17．A.immediately

　　B．finally

　　C．gradually

　　D．recently

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