Verb conjugation of "blacken" in English

It means a lot to me to participate and meet other people in this Internet forum. I'll know later if I can move my appointment in order to get together with our visitors from Canada.
Please explain me the exact differences between British and American .... This year I'm trying to make the TOEFL. We can then discuss how we can prepare for this exam. I failed the first time.
These are very good images, please send me more... I think Oslo is a very calm city. Every day it is getting more international and culturally richer. I work as a general secretary in a law firm.