Во сколько раз кулоновская сила отталкивания протонов больше силы их гравитационного притяжения?

1.has
2.are
3.worked
4.sees
5.collected
6.is
7.doesn't know

1. He usually has a lot pf work to do
2. There are many English and French books in his library
3. His elder sister worksed in a factory two years ago
4. She never seen her aunt
5. His sister collected stamps last year
6. Next week there will be a concert in the park
7. He doesn't know anything about his parents