Past Tenses

The excersices were nice, and some of them were also difficult because you had to think well how you would do them !
.And sometimes you I got lost with all the words and structures.I enjoyed them a lot but in most of them ,because of the difficulty, I got bored but I could finish them anyway!!!!!!My score in the fisrt page was about 90% and in the other it was about 80% because those were the most difficult of the two pages.In my opinion I must excercise more but I like doing difficult excercises because it is easier to understand after you have worked and worked,moreover if you had learned it in the most difficult way to learn them.