Задайте все типы вопросов к предложению( общий, специальный, альтернативный, разделительный): for many centuries improvements in agriculture came slowly.

1. Did improvements come slowly for many centuries?
2. For many centuries improvements in agriculture came slowly, didn't they?
3. How did improvements in agriculture come for many centuries?
4. Did improvements come slowly in agriculture or in genetics for many centuries?

1)Did improvements in agriculture come slowly for many centuries? 

2)How did improvements in agriculture come for many centuries? 

3)Did improvements in agriculture come slowly or quickly for many centuries? 

4)For many centuries improvements in agriculture came slowly, didn`t they?