1．A．Jim and Mary both work hard．
B．Jim works harder than Mary．
C．Mary doesn't work hard but Jim does．

2．A．The teachers speak Japanese easily．
B．The teachers find it difficult to learn Japanese．
C．It's easy for the teachers to speak Japanese．

3．A.I have fewer apples than you do．
B.My apples are green and small but yours are red and big．
C.Your apples are better than mine．