看到结果时，她无法掩饰自己的失望。

She couldn’t ___hide her disappointment when she saw the results.

关于他的过去，有些事情他试图隐瞒。

There was something about his past that he tried to ___hide.

听到这个好消息时，我无法掩饰自己的兴奋。

I couldn't ___hide my excitement when I heard the good news.