Перефразируйте используя инфинитив Any thought of the coming exams made him depressed. They heard a loud blast and out

Для первого предложения допустимо несколько вариантов ответа: Thinking about the coming exams made him depressed; Any thought of the coming exams was depressing for him. Второй же случай более однозначен: After hearing a loud blast they suddenly saw a plane on fire.