她对赢得金牌的机会持乐观态度。

She is ___optimistic about her chances of winning a gold medal.

我对谈判的结果不太乐观。

I'm not very ___optimistic about the outcome of the negotiations.

尽管面临挑战，他仍然对未来保持乐观。

Despite the challenges, he remains ___optimistic about the future.