在黑暗中我什么都分辨不清。

I couldn't ___distinguish anything in the darkness.

在黑暗中我什么都分辨不出来，吓死了。

I could ___distinguish nothing in the darkness and was scared to death.

借助助听器，他能分辨出不同的鸟鸣声。

With his hearing aid, he can ___distinguish different bird songs.