1,I saw the man （run） on the playground.

1,I saw the man （run） on the playground.
2,She is a new worker,so she has many problems （ ） what machine now.A.use B.to use C.uses D.using
3,It is a （ ）shirt.
A.new nice B.nice new
4,I don`t think it is easy to get on well with each other.做反意疑问句.
I don`t think it is easy to get on well with each other,（）（）?
麻烦写一下简略思路