You will find that most of the answers are in the textbook (as obvious as it is).
I've completed Ch 4 TPS, but it's in my IPT book (some are handwritten, some are typed, but I never save my homework on computer... type it out, print it out).
All your answers will be found in the text, sorry if that sounds unhelpful, because the questions are asked in sequential order, as they are found in the text. It is really easy to find answers to certain questions, when they follow the previous question in terms of layout.
I know that doesn't help you out, but you'd be reading the textbook anyway, for revision that is, instead of reading "plain answers" if you know what I mean.
Sorry,