It's difficult to find the blind spot of that problem.

Please tell me that story once again.

He was wearing a hat made of felt.

He was as quiet as the dead.

He is suffering from the symptoms of black hairy tongue.

He was taken to the operating room.

She decided to undergo facial reconstructive surgery.

She decided to have plastic surgery to gain confidence.

He was standing at the summit of the mountain.

We conducted a detailed investigation into the issue.