Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
extermination - n. the act of destroying and killing
sham - adj. something that is not what it appears to be and that is meant to trick or deceive people
massacre – n. the violent killing of many people
response - n. answer
adequate – adj. enough for some need or requirement
sanitation – n. the process of keeping places free from dirt, infection, disease, etc., by removing waste, trash and garbage, by cleaning streets, etc.
rampant – adj. growing quickly in a way that is difficult to control
