hugger - n. someone who likes to give hugs (the act of putting your arms around someone or something as a way of showing love or friendship)

challenging - adj. difficult, sometimes in a way that is interesting or enjoyable

knock - v. to hit something (such as a door) with the knuckles of your hand or with a hard object

flu - n. a common disease that is caused by a virus and that causes fever, weakness, body aches, and breathing problems

virtual - adj. existing or occurring on computers or on the Internet

district - n. an area established by a government for official government business

audience - n. the people who watch, read, or listen to something