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她过去常常把钥匙藏在一个小盒子里。

She used to ___hide her keys in a small box.

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.

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.