Complete the sentences with the prepositions below.

After, at, by, for, in, of, to

1.She travelled to and _______ work ____bus.
2.It was ______ the South ______ the USA.
3.Black people had to sit _______ the back.
4.She had to give her seat _______ a white man/
5.They did this _______in 381 days.
6._______ a year, the State of Alabama changed the law.