Your CV is your first impression and first impressions count.
Writing a CV is an important task. Your CV will be the thing that sets you apart from other people searching for a work placement and impress potential employers to take you on.
So you've finished that placement. What do you do next?
There are several things you can do which ensure that you stay on good terms with the people that gave you the placement and perhaps they'll even offer to take/keep you on in future.