Ответ:

2.does, if, are. If we are noisy we have to sit at the front.

3.does,if.When she wants to relax,she goes to the garden.

4.do,if.If I feel sad, I talk to my friends.

5.if,does.My dad usually goes to Italian restaurant, if he wants to eat out.

6.don't know, do.If I Don't know the answer, I don't ask my teacher.