她在不到四小时的时间里完成了她的首次马拉松。

She completed her first ___marathon in just under four hours.

为了明年跑马拉松，我每周应该训练多少小时？

How many hours per week should I train to run the ___marathon next year?

他正在为波士顿马拉松进行严格训练。

He is in serious training for the Boston ___marathon.