如果她知道有需要，她会很乐意去做志愿者。

She'd ___happily volunteer if she knew it was needed.

大多数顾客会非常愿意为更好的服务多付一点钱。

Most customers would ___happily pay a little more for better service.

如果您认为我准备好了，我会非常乐意承担更多责任。

I'd ___happily take on more responsibility if you think I'm ready.