cultural linguistic as well. this is a cantonese speaking city, mandarin. it's been a huge influx of mainlanders to hong kong. they have driven up property prices creating a housing crisis. that's particularly by the youth here feel alienated and disaffected. they feel they will never get a chance to own their own home. part of why many people are celebrating 20 years of handover from britton china. >> even rain adding to it there. ivan watson showing us the spirit of hong kong live there. thanks for the report, ivan. still ahead here on "newsroom," iraqi forces say they will retake mosul within days. that may be the hardest part of the challenge. ahead, we'll discuss why securing that city could prove each more difficult.