Помогите с упражнением по английскому

Helen speaks English better than Mary does.
Does Helen speak English better than Mary does?
How does Helen spak English?
Who speaks English better?
Helen speaks English better than Mary does.
Does Helen speak English better or worse than Mary does ?
Helen speaks English better than Mary does,doesn't she?

English is one of the most popular languages in the world.
Is English one of the most popular languages in the world?
Where is English one of the most popular languages ?
What language is one of the most popular languages in the world?
Is English or French one of the most popular languages in the world?
English is one of the most popular languages in the world,isn't it?