23.　 be on watch/duty

22.　 the man on watch

21.　 A hit B=B was hit by A.

20.　 could sb do…?

19.　 over...=more than…

18.　 the largest and finest

17.　 set off (from…to…)

set off for…

set off = start

16.　 in+月份+年份

on +月+日+年

15.　 the sad story of…

14.　 say something about…

say …(hello, goodbye)

say… to sb.

say to sb …