I can’t remember when I started collecting litter. But it was when I got tired of   46  litter nearby that I realized no one else was going to pick it up.
I live near a forest in Ohio, America. I can walk there   47  three minutes. I used to love going there to play with my dog. But one day there was   48  much litter there that I became very unhappy. I decided to clean up the forest, and I wanted to   49  happy when I went again. I made my first trip to clean the forest that afternoon. I took a big black rubbish bag with me. Ten minutes   50  I started to pick up litter, my bag was full! There were cans, bottles, broken glass and newspapers in it.
From then on, I  51  to the forest four times a year to pick up litter. I often stay there for three hours. It makes me feel   52  to do something for the environment. After each trip, I look through all the litter that I’ve collected. If   53  of it is recyclable（可回收利用的）, I’ll keep it. I can’t understand why people drop litter. But I will keep on picking it up   54  they stop dropping it.. I know I am only doing a small bit   55  the earth, but I still think it is important.
小题1:A.seeing           B.throwing          C.dropping         
小题2:A.after            B.for               C.in
小题3:A.such         B.very              C.so                   
小题4:A.make         B.feel              C.look             
小题5:A.after            B.later             C.before               
小题6:A.had gone     B.have gone         C.go               
小题7:A.tired            B.sad               C.great
小题8:A.many         B.few               C.any      
小题9:A.until            B.after             C.as soon as           
小题10:A.helped          B.to help               C.help