Had the train arrived by that time? сделать 5 вопросительных вопроса

What had been done by that time?
had the train arrived by that time?
when had the telephone rang?
had teacher checket the tests before she left for home?
had mommy cooked the dinner when her children came home.

P.s. (а что посещают не вопросительные вопросы?) ;)

1. When had the train arrived?
2. Why had the train arrived by that time?
3. Where had the train arrived by that time?
4. The train had arrived by the time, hadn't it?
5. What arrived by that time?