[参考答案]
一、
1-5 might, may, Could, could, Can 6-10 may not, can’t couldn’t, could , might
11-15 must, can’t, shall, should, will
二、
1－5 AABAA 6-10 AADCD 11-15 BCACA 16-20 DBABC
21-25CBAAC 26-30 ADCCB 31-35 DDABC 36-40 DDCAB
41-45 BCAAB 46-50 BCCDA 51-55 CDACD