Present simple vs present continuous

I ... Mary is Scottish, but I'm not sure.

Don't disturb her! She ............. of a solution to this problem.

She .............. the chocolate to see if it is sweet enough.

I ........... with some friends until I find a place of my own.

My parents ....... in London. They have lived there all their lives.

I have lost my pen. I ........... things.

Carol is never satisfied. She .............. .

Peter ........... of giving up his job.

I can't understand why he ......... so rude. He isn't usually like that.