Sources to practice:
https://www.cambridgeenglish.org/images/168877-tkt-module-1-differences-between-l1-and-l2-learning.pdf
https://www.eltconcourse.com/training/tkt/tktmodule1/tktm1l1andl2learning.html
https://www.eltconcourse.com/training/tkt/tktmodule1/practicetests/tktl1l2learningpractice1.htm
https://www.eltconcourse.com/training/tkt/tktmodule1/practicetests/tktl1l2learningcloze1.htm
