在音乐会上欢呼过后，我的嗓子完全哑了。

After cheering at the concert, I've completely ___lost ___my ___voice.

在他做重要演讲时，他突然失声了。

During his important presentation, he suddenly ___lost ___his ___voice.

我的老师因为上了太多课而失声了。

My teacher ___lost ___her ___voice from teaching too many classes.