1 . Water shortage is one of the greatest crises facing us today, with two ________________ (three) of the global population living in areas where water is scarce for a month or more every year. (所给词的适当形式填空)

2 . However, in the urban district of Beijing houses along hutongs still occupy one _______ (three) of the total area, providing housing for half of the population. (所给词的适当形式填空)