Not until I went through his paper _________ what rapid progress he had made in writing.

Hello, is Mr Smith in ——Sorry, there is no such person ______ you referred to in my office.

Richard __________ injured in the car crash，but I didn’t stop him driving after he drank some beer．

I’m afraid I’m not ____ to help with the show, for I am fully occupied with my own project．

Which sentence is wrong?