Question

перефразируйте используя инфинитив
Any thought of the coming exams made him depressed.
They heard a loud blast and out of a sudden saw a plane on fire.

Answer 1

1 it made him depressed to think of the coming exams 

2 Не знаю, нет здесь хороших вариантов, точно нет
 They heard a loud blast only to see a plane on fire