I was very tired.When I...to bed, I fell asleep immediatelly

Question

I was very tired.When I...to bed, I fell asleep immediatelly

Answer 1

When I go to bed,I fell asleep immediatelly

Answer 2

А там написано какие глаголы нужно вставлять? Вдруг там какие-то дополнительные типо have to... А есди нет,то тогда I go to bed...