请将你的物品放在行李舱内。

Please keep your belongings ___within the luggage compartment.

请在一小时内回复这封邮件。

Please reply to this email ___within one hour.

超市就在我家五分钟步行范围内。

The supermarket is ___within a five-minute walk from my home.

这个问题在我的能力范围之内。

This problem is ___within my ability.