Ответ:

Перевод задания: Выберите правильное слово: медицинская справка или учёная степень.

Medical certificate — медицинская справка; degree in Criminal Law — степень в области уголовного права.

a) Before he can join the basketball team, Nick has to bring a medical certificate stating that there’s nothing wrong with his health.

b) Sam has helped the police department solve very difficult cases, as he has a degree in Criminal Law.

Ответ: a) certificate; b) degree.