Copyright and Fair Use SR

In the copyright and fair use quiz there were a few questions that stuck out to me:
7. An elementary school designs a password-protected Web site for families and faculty only. It's OK for teachers to post student work there, even when it uses copyright material without permission.
That is true, however, i feel as though it shouldn't be allowed because they cannot guarantee it will not be seen by other people.
8. A student film buff downloads a new release from a Taiwanese Web site to use for a humanities project. As long as the student gives credit to the sites from which he's downloaded material, this is covered under fair use.
This is false, but my question is how do they know the information isn't accurate, i just think students need to be careful where they get their information from. They should not be prohibited from using a website like this for a project.
10. A teacher gets clip art and music from popular file-sharing sites, then creates a lesson plan and posts it on the school Web site to share with other teachers. This is permissible.
I think this is a great way for teachers to be creative; however, I think it is sharing it with other teachers that is the problem. I think teachers should be able to disperse their creative ideas with other teachers.
14. On Back-to-School night, an elementary school offers child care for students' younger siblings. They put the kids in the library and show them Disney VHS tapes bought by the PTA. This is permissible.
I completely disagree with this being false. I think if the tape is bought it should be able to be viewed by anyone. The problem I feel lies within burning it and then sharing it.
15. A teacher makes a compilation of movie clips from various VHS tapes to use in his classroom as lesson starters. This is covered under fair use.
I don't understand the problem here, as long as the teacher is citing the sources there should be no problem. This is another great way to be creative that teachers can't use.
16. At a local electronics show, a teacher buys a machine that defeats the copy protection on DVDs, CD-ROMs, and just about everything else. She lets her students use it so they can incorporate clips from rented DVDs into their film genre projects. This is fair use.
I originally had this as false, I didn't think teachers were allowed to "defeat" this copy protection on DVDS, and CD-ROMS, but I am glad it is true.
20. Last year, a school's science fair multimedia CD-ROM was so popular everyone wanted a copy of it. Everything in it was copied under fair use guidelines. It's permissible for the school to sell copies to recover the costs of reproduction.
I originally had this as true but I guess I didn't look at the big picture. I agree this should be false because you should not be able to sell copies to benefit yourself.