VOA慢速英语:Attacks, Animals, Activism Are Trending Stories of 2015

engage – v. to get and keep (someone's attention, interest, etc.)

custody – n. the state of being kept in a prison or jail — used after in or into

momentum – n. the strength or force that something has when it is moving

silly – adj. playful and funny

stirred-up – v. to cause (someone) to feel a strong emotion and a desire to do something

meme – n. an idea or behavior that spreads from person to person