He used a stone to block the hole.

I heard a noise in the middle of the night and got scared.

He is oversensitive to sound, and he covers his ears even at a slight noise.

He has an oversensitivity to sound, so he prefers to work in quiet places.

He seems a little tired.

He can speak a little Japanese.

He is learning Japanese little by little.

If you try a little harder, you can achieve your goal.

He didn't listen to my story at all.

He is my best friend.