None of these sentences need the suggested commas, and in some of them it would even confuse the meaning of the sentence. The most times you only need a comma are to:

  1. Separate clauses (not all of the time)
  2. Separate infinitive phrases at the beginning of a sentence from the rest of the sentence
  3. Separate items of a list

Some of your sentences have one of a couple of exceptions to this rule of thumb, and one or both of you suggested commas are still grammatically correct. That being said, don't get comma-happy. When in doubt, leave the comma out. Take a look at this page and its many links for all the info you need on comma usage: http://grammar.ccc.commnet.edu/grammar/commas.htm