Are these sentences grammatically correct?

I've been doing housework all day today. I've cleaned every room in the house.
London has changed a lot since we first came to live here.
The old cross was standing on top of the hill as long as anybody can remember.
I got this job in January, and since then I've been spening most of my time travelling
When i met him he's been working as a waiter for a year or so.
Have you finished in the bathroom yet?
Thanks for your answers