unit 1 learning a foreign language <br>unit 2 pop music <br>unit 3 higher education <br>unit 4 economy <br>unit 5 war and conflicts <br>unit 6 politics <br>unit 7 digital technology <br>unit 8 energy crisis <br>unit 9 natural disasters <br>unit 10 environmental protection <br>unit 11 internet and other addictions <br>unit 12 colorful cultures <br>unit 13 discoveries <br>unit 14 arts and literature <br>unit 15 social interactions <br>unit 16 law and order