1---20 CBBBA BBBAB CBDBA CCADB

　　21---30 C B A B D C A D B B

　　31----45 A C A D C A A D B C C F E G A

　　46.shoes 47.wrote 48.the 49.back 50.of

　　51.But 52.spent 53.him 54.try 55.than 新

　　56.clean 57. wind 58. pollution 59. Cheap 60. sunny

　　61.I am a boy.I am twelve years old.My favourite sport is swimming.I like swimming with my father in summer.He teaches me how to swim well.I hope I can swim as well as him.I think swimming is good for our health.Swimming makes us happy.I like it.Do you like swimming?