答案：

1-5　 C A B B D
6-10　C B A C D
11-15 C D B A B
16-20 D A C D C
21-25 A B C A D
26-30 B D C A D
31-35 B C B D A
36-40 C A C D D
41-45 C A B A D
46-50 D B A C A
51-55 B C B A C
56-60 B D D A C
61-65 B A A C B
66-70 A D C D B
S1. being > been
S2. their > its
S3. relative > relatively
S4. good > poor / bad / scanty
S5. as > /
S6. politics > political
S7. by > for
S8. double > doubled
S9. few > fewer
S10. reason >a reason