Раскройте скобки, использую диеслова Present perfect или Past Simple

We (not yet to salve) the problem
When it all (to happen)?
The morning was cold and rainy, but since ten o'clock the weather (to change) and now the sun is shining brightly.
Show me the dress which you (to make)
Oh, how dark it is! A large black cloud (to cover) the sky. I think it will start raining in the few minutes.
Oh, close the window! Look, all my papers (to fall) on the floor because of the wind.
When you (to open) the window? - I (to open) it ten minutes ago.
The sun (not to rise) yet, but the sky in the east is getting lighter every minute.