Помогите английский скайсмарт

Вот решение задания:
1. We had been walking for three hours before we came to Brighton.
2. Jane had tidied up her room by 10 o’clock.
3. She has been dancing since morning.
4. Jake had already done his homework when his friend called him.
5. I had just fallen asleep when the phone rang.
6. Steve had been playing video games all evening early morning.
7. How long had you been waiting when he finally came?
8. By the time we reached the station, the train had already left.

Правильные слова: for, by, since, already, when, all evening, how long, by the time.

1 for
2 by
3 all evening
4 already
5 when
6 since
7 How long
8 By the time