marathon

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.

他去年春天参加了伦敦马拉松。

He participated in the London ___marathon last spring.

她在不到三小时内完成了她的第一次马拉松。

She ran her first ___marathon in just under three hours.