who is stronger?

Who is stronger do you think in history? Mongolia's army or the Jurchen army?

how many rules about the eglish liaison? I know the consonants and vowels can be read liaison, how about vowels to vowels? eg"just do it", it sounds like {dʒʌst du: wit} right? who can tell me more about the english liaison? thank you very much.

how to improve my listenning? when I call with my foreign customer, I always cant follow them, when they speaking the recent sentence I opten remember the last sentence, how to improve my listenning?

how to pronounce when the word add "s""es""d""ed" and so on? I always confuse.

how about Detroit city? I heard that Detroit city broke, I am very worried about that, because I like the NBA team Detroit pistons,I wana know if they will migrate the home court? And I know that Detroit is the famous automobile city, general motors, Ford and Chrysler are located where the city of bankruptcy, Does it influence on them? the workers will be unemployed? when Detroit will be developed? I hope everything is good.

why people in West have different colror hair?

why people in west have different color hair? some one is black and someone is yellow. if we can distinguish their countries from the appearance?