I ________ going to be famous? Sam is going to ___________the lyrics

1. I ________ going to be famous
a.is.            b.are.         c.am.          d.be
2. Sam is going to ___________the lyrics
a.change.      b.changes.       c.changing.       d.changed
3. They ________ going to write a popverson
a.isn't           b.am not.            c.aren't.           d.be not 
4. She going to________ at home
a.is.         b.are.               c.am.         d.be