1 . Nei juan, or “involution”, is a buzzword meaning irrational competition, which makes people full of   ________ (焦虑) and burned out. (根据汉语提示单词拼写)

2 . Working out regularly every day for at least half an hour helps a lot to reduce one’s tiredness and ________ (焦虑). (根据汉语提示单词拼写)

3 . A sense of ________ (焦虑) could arise if we were addicted to various social networking applications. (根据汉语提示单词拼写)

4 . "Thunderstorm ________（焦虑）" is common among dogs, and some dogs tremble with fear under the owner's beds during thunderstorms. （根据汉语提示单词拼写）