http://www.englisch-hilfen.de/en/exercises/reported_speech/questions.htm
http://www.e-grammar.org/reported-speech/test2-exercise2/
http://www.englishexercises.org/makeagame/viewgame.asp?id=3764
https://www.ego4u.com/en/cram-up/grammar/reported-speech/exercises?05
