完形填空. 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 ! I used to love going there 5 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. (     )1. A. see (     )2. A. no one else (     )3. A. school (     )4. A. months (     )5. A. playing (     )6. A. look (     )7. A. first (     )8. A. after (     )9. A. play (     )10. A. worried B. seeing B. I B. forest B. hours B. play B. feel B. third B. later B. go B. sad C. look C. everybody C. river C. days C. of play C. make C. fourth C. before C. work C. disappointed D. looking D. anybody D. park D. minutes D. to play D. see D. fifth D. of D. sit D. great