他觉得很难表达爱意。

He finds it difficult to ___show affection.

当她从火灾中救他时，她表现出巨大的勇气。

She ___showed enormous courage when she rescued him from the fire.

我不知道如何表达对你所有帮助的感谢。

I do not know how to ___show my thanks for all your help.