完成这个项目后，他感到巨大的成就感。

After finishing the project, he felt a great sense of ___fulfillment.

按时完成项目给了他极大的成就感。

The ___fulfillment of the project on time gave him a great sense of accomplishment.

这家电商平台的订单履行速度非常快，通常在下单后24小时内就能送达。

This e-commerce platform has excellent ___fulfillment speed, usually delivering within 24 hours after an order is placed.