Q. textbook p. 42

A.

The school is planning to stop providing printing paper in computer lab.  (always mention what the reading is: “the ANNOUNCEMENT/TEXT/ETC. says that...”)

The woman disagrees with the plan.

(you could even combine the last two sentences by saying The woman disagrees with the school’s announcement to stop providing...)

First of all, THE WOMEN STATES THAT a lot of students use computers for school work.  She and her friends used to print school materials.

Also, SHE MENTIONS THAT if the school doesn’t provide the printing paper, students won’t use the computers. SHE PREDICTS THAT even though they paid for using the computer lab, they won’t wouldn’t use it anymore if they should have to bring their own papers to print their materials.

Okay, here is the difference between should and have to:

"Have to" implies it is imperative that they bring the papers. It is a rule that they can not get around.  There is no alternative--they must bring their own print materials; "Have to do something -> It's absolutely necessary for someone to do something and someone else requires it."

"Should" is somewhat weaker.  It is a requirement but some how softer than "have to".

"Should do something -> It's a good idea for someone to do something."

Read more here: http://esl.about.com/od/grammarintermediate/a/mvbasics_ex.htm

I don't think using should instead of have to will kill you on the toefl, however, every little point counts when you are trying to bump up your score that one point.