21-23 BCB 24-27 DADB 28-31 CADA 32-35 CDAD 36-40 EFAGD 41- 45 BACAD 46-50 BCABC
51-55 DDADC 56-60 DCBBA 61 have worked
62 who/that 63 as 64 in 65 challenging
66 requiremens 67 shared 68 ultimately 69 to choose 70 a
1 dates back 后加 to 2 been inventing – invented
3 sang songs – singing 4 that – which
5 respectively – respective 6 删除addition 前的an
7 hero – heroes 8 it become – they
9 and works – but 10 makes – made
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