Difficult material can be found in any subject matter. Therefore it is important to acknowledge that often we may encounter content about different topics that may be too complicated to be absorbed rapidly and in great amounts; that is to say, if the material is very complicated, it is advisable to go over it slowly and little by little in order to be able to capture its intricacies and be able to follow the arguments presented.
Since Rachel has been leaning forward throughout the evening, Rachel, I believe was being lustful to Matthew in a seductive way and in human first impression Matthew leaned back in his chair. but don't take my word for it.
The first one is the answer because pale has neither or negative or positive connotation and arrogant has a negative connotation. hope this helps! <span />