1. Choose the correct answer. 1. The children was / were in the classroom at eleven o'clock.

1. The children were in the classroom at eleven o'clock.

Выбор пал на форму "were", так как слово "children" (дети) стоит во множественном числе. Для множественного числа глагол "to be" имеет форму "were" в прошедшем времени.

Ответ: were