It took me__hour and__half to finsh__work.怎么用冠词填空___elephant is bigger than___horse.怎么用冠词填空?

1、An a the
2、An a

It took me an hour and a half to finsh the work.
An elephant is bigger than a horse

1、An a the ,一个半小时,固定用法an hour and a half , the work,the表示特指
2、An a 大象比马大,表示泛指.