从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1 .My daughter volunteered to work in a remote mountain village in West China last year, which is still _________on foot now．
A． accessible B． available
C． appropriate D． responsible
2．I got this dictionary for . My brother gave it to me when he graduated.
A．nobody B．somebody C．anything D．nothing
3．—Did you forget your promise, dear?
— I have finished my homework on time, mom.
A．Excuse me. B．Surely. C．Why not? D．How could I?
