参： 1-5ABCBC 6-10CABAA 11-15CACAC 16-20BCBCC
21-15ABBAC 26 beach
27 9:30(half past nine) 28 bike 29 sister
30 some food (food) 31-35 CBDAD 36-40 CADBC 51-53dab -56dbd
57-60 CADB 61-65 DADAC
66. solve old problems ic control
68.Walk again.
69 3D printing is another new technology for the future. 70在这个世界上,技术使人们的生活更容易和更安全。
75. an 76. but 77. matches 78. faster 79. won
81. was my birthday yesterday.
had a party with my classmates. 83.They sang a birthday song to me. 84.There were lots of fun games. 85.What a great time we had! 86略
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