Comparative adjectives

https://agendaweb.org/exercises/grammar/comparison/comparison-write-2

https://agendaweb.org/exercises/grammar/comparison/comparison-write-3

http://www.perfect-english-grammar.com/comparative-adjectives-exercise-1.html

https://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises

https://elt.oup.com/student/solutions/elementary/grammar/grammar_08_012e?cc=global&selLanguage=en

https://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adjectives_comparison_sentences.htm

http://www.learnenglish-online.com/grammar/tests/comparativeadjectives2.html

http://speakspeak.com/english-grammar-exercises/elementary/comparative-adjectives-2