Вопрос по английскому языку:

Помогите с английским пожалуйста
Put down questions to the following sentences.
Пример
They had done their homework by 5o'clock last night.
Had they done their homework by 5 o'clock last night?
1.Anna had done three exercises by the end of the lesson.
How many________________________?
2.She had made dinner by 7.p.m
By what time ________________?
3.He wasn't hungry.He had just had a sandwich.
How many _____________?
4.I hadn't seen her for a long time before I met her again.
How long________________?
5.You had left by the time I came to the bus stop.
Why__________________?