当他谈到公司未来时，他的声音里带着一丝乐观。

There was a note of ___optimism in his voice as he spoke about the company's future.

从你的考试成绩来看，我认为你有理由对获得大学录取名额持谨慎乐观的态度。

Judging from your examination results, I think you have cause for cautious ___optimism about getting a university place.

我们心中充满了乐观、好奇以及荒唐的恐惧交织在一起的复杂情感。

Our hearts were full with a mixture of ___optimism, curiosity and absurd fears.