Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
census – n. counting of people living in an area to
trend – n. a general direction of change :
survey – n. an activity in which many people are asked a question or a series of questions in order to gather information about what most people do or think about something
informal – adj. not requiring serious or official behavior
factor – n. something that helps to produce a result
bureau – n. a specialized office or agency
resident – n. someone who liv
