учебный год был очень тяжелый и к к

учебный год был очень тяжелый и к концу года они были без сил

Результаты (английский) 1:

the school year was very heavy and by the end of the year they were without force

Результаты (английский) 2:

academic year was very hard and by the end of the year they have been exhausted

Результаты (английский) 3:

the school year was very heavy, and by the end of the year they were without power