listen I downloaded the book firstly then read it page by page and I did exercises one by one and I did them right all self corrected I got excellent mark in each unit there were 5 units and the last test I got as excellent and the tests were a puzzles and crosswords not filling the gaps and I finished the book just in 10 days but I was studying it day and night 6 hours at least in a day.....but this was a three years ago and now I just remember only a few list coz I don't use them and I'm going to study it again mybe we'll make it as a section here who knows and thank you or interesting see ya