Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
mask – n. a covering that hides the face
extinct – adj. no longer existing
demon – n. an evil spirit
rehearse – v. to practice a play, dance, etc. in order to prepare for a performance
elderly – adj. an old or aging person
preserve – v. to keep something the same or prevent it from being damaged or destroyed
