Keys:

　　1-10 CABCB BADBC

　　11-20 DABAC BBADC

　　21-30 BDCBA DDADC

　　31-40 CBACB ACABB

　　41-50 BDCCB CBBDC

　　51-55 DCCCB

　　56. 删去 for 57. In-On 58. sit-sitting/seated 59. cry-crying 60. √

　　6l. 删去 had 62. (第二个)police 前加 the 63. this-that 64. near-nearly

　　65. 删去have

　　Sunday September 15

　　Fine

　　Today I went to the Fu&Nan Rivers as a young volunteer to clean the place. Early in the morning we started by bike. As soon

　　as we got there, we began to work. First we collected the rubbish on the river bank. Then we put up notices to tell people

　　to protect the environment. We kept on telling the visitors the importance of protecting the environment. Having cleaned

　　the river bank we said goodbye to the workers and went home. Though I was tired, I felt happy.