Mis maestros (necesitar) papel.
necesitan
necesitamos
necesito
necesitáis

Mis maestros necesitan papel.
Again, similar to the previous question, since this is third person plural (they), you would use the verb form ending in -n, such as necesitan, since that is the plural form.
Necesitamos is used for we.
Necesito is used for I.
Necesitais is used for you, plural. 

When do your brothers brush their teeth?

Yes she will ask you about the materiales that you will need for school in spanish and also which is your favorite class : )