Fill in the Blanks ABCDEFOnline version ABCDEF by Keith Sou 1 residential scarce commercial relatively 1 . Land resource is very in Macau which has a higher proportion of and residential mixed areas . 2 . Public housing estates are low - income residential areas developed by the government to provide affordable homes for local residents . 3 . Private housing estates are middle - income areas . 4 . high - income residential areas are spacious with smaller population . The population density is lower .