Помогите! Не могу сделать. Надо поставить must, mustn't или must not и еще там цифра 2 тоже надо

Огромное Спасибо!!!

Завтра выберу лучшим ответом

1. Ken must feed them every day, i think he mustn't keep them in the house.2. Nelly must keep the bird in the cell and she must not let her cat to catch up the bird.3. Pete must walk with his dog twice a day. And he mustn't let his dog to bark on strangers.May I help you?