7 Question's to Ask Your Proposed SEO Partner

Hi,
As i think before signing any contract for SEO,
just ask your proposed SEO Partner
these question's drafted below :

1.What is your SEO Portfolio?
2.Techniques they are using for SEO.Risk of using these techniques?
3.ROI (return on Investment)?
4.How much time it will take to show up in Search Engines?
5.Do they offering SEM to Support SEO services?
6.What would you expect from our end to make this campaign succesful?
7.What will happen after the end of the SEO Contract?

Cheers