Complete the sentence with the correct part.

Nowadays he can manage eighty storeys but, amazingly, Alain suffers from vertigo – he feels dizzy when he’s up high! He has fallen seven times, suffering dozens of broken bones, which has left him partially disabled. But this doesn’t stop Alain. “I only think about what I can do, not what I can't do,” he says.

Alain has a problem with

• heights.
• confidence.
• crowds.
• doctors.