她向他保证车第二天就能准备好。

She ___assured him that the car would be ready the next day.

我可以向您保证，付款将在今天处理。

I can ___assure you that the payment will be processed today.

经理向她的团队保证他们的工作是稳定的。

The manager ___assured her team that their jobs were secure.