他因帮助警方破案而获得了丰厚的奖励。

He received a generous ___reward for helping the police solve the case.

他们提供了5000美元的悬赏金寻找丢失的画作。

They offered a $5000 ___reward for the return of the missing painting.

老师奖励了全班同学每人一块巧克力，因为他们在考试中表现优异。

The teacher decided to ___reward the whole class with chocolates for their excellent performance in the exam.