问题:
A. use(less) B. end(less) ...
问题:
A. c(oo)l B. fl(oo)d ...
问题:
A. ea(s)y B. noi(s)y ...
问题:
A. walk B. walking ...
问题:
A. to lock B. .locking ...
问题:
A. would reach B. will have reached ...
问题:
A. took to B. took after ...
问题:
A. should know B. had known ...
问题:
A. is he B. isn‘t he ...
问题:
A. require B. requiring ...