尽管有挑战，生活并非全是悲观失望。

Despite the challenges, life isn't all ___doom ___and ___gloom.

专家们经常对未来散布悲观言论，但我们应该保持乐观。

Experts often spread ___doom ___and ___gloom about the future, but we should stay optimistic.

不断的灾难新闻在公众中营造了一种悲观绝望的氛围。

The constant news of disasters creates a sense of ___doom ___and ___gloom among the public.