Давай исправим текст!
В предложении нужно заменить слова idler, driveshaft, Fired, our hedh.
Исправленный текст:
An engine is connected to a driveshaft. Fitted to this output shaft is a gear wheel called driver. As this gear wheel turns, it drives another gear wheel alongside it called idler, which is fitted to an input shaft.
Ответ: driver, turns, idler
Все отлично, у тебя все получится!