1-5：BCBAC 6-10：BCCAC
11-15：BBACA
16. 11\eleven 17. by car 18. doctor 19. student 20. happy
21-25：CABCD 26-30：ACCAD
31-35：BADAD 36-40：CBCAB
41-45：CABBA 46-50：ABADD
51. funny 52. join 53. scary
54. studying 55. dream
56. exciting 57. tells 58. giraffes
59. to buy 60. friendly
61-65：FBAED
66. can’t sing 67. takes the bus 68. Don’t go out
69. Why does 70. When does

书面表达：
On Sunday, I go to the zoo with my mother. There I see many kinds of animals, like elephants, pandas, lions and tigers. These animals are quite different. Some are very cute, but some are ugly. Some are scary, but some are friendly. I have a good time in the zoo, because I love these interesting animals so much.