1. We..... go to school every day, but we ..... go to school on Sunday.

1. Необходимо выбрать между have to, don't have to, has to, doesn't have to.
Поскольку местоимение we (мы) стоит во множественном числе, то has to, doesn't have to не подходят. Далее, по смыслу: мы должны ходить в школу каждый день, но не должны ходить в школу в воскресенье. Соответственно, выбираем have to и don't have to.

We have to go to school every day, but we don't have to go to school on Sunday.

Перевод: Мы должны ходить в школу каждый день, но мы не должны ходить в школу в воскресенье.

Ответ: We have to go to school every day, but we don't have to go to school on Sunday.