Помогите! Срочно!Choose the correct word (what where, when, who, why, how,

Помогите! Срочно!
Choose the correct word (what where, when, who, why, how, which, whose) to make the sentences complete.

1) No matter ... long it takes to study Russian literature of the 19th century going I am going to do it. It is a matter of importance for me.
2) No matter ... you think of a profession of a stunt man am going to take it up.
3) No matter ... he gets a promotion he will work hard on the project.
4) No matter ... you have decided to do, you will be responsible for the circumstances
5) No matter ... you are going to work, you should be capable of dealing with people
6) No matter ... said it the quality of work is the most important factor.
7) No matter ... of you мейд a mistake, the project is under failure now. It is such a disappointment!
7) No matter ... advice you will choose, it is important to make the right choice not to regret it all your life.