1) Housewives are busy doing Spring Festival shopping.

2) All those people dead and there we were, busy doing nothing except feeling sorry for ourselves.

3) The irony is that we are busy doing many things that don't matter and we have no time for things that do. Shouldn't we reverse it? RVM 

4) A be busy doing sth.

5) Be busy doing sth.

6) Her mother is busy cooking in the kitchen. be busy doing sth.