Your textbook or lab manual or class notes (your own or someone else's) may have the exact answer your instructor is looking for, so you should check harder to give the perfect answer. However ...
for 1). what can you guess would happen if you break vacuum some other way?
for 2). try to realize the world of chemistry is not in your lab, I have never used the "thick heavy-walled red rubber tubing". However, have you ever tried to use thin rubber tubing for this application? What happens?
for 3). you should have noticed a theme with these questions by now. What are the other two questions trying to prevent?
Really develop your text book, lab manual, and class notes reading skills. You are missing some very basic steps. If you've missed these, you have likely missed some more important steps, and you could get hurt in the lab, not just a low grade from missing points.