F9 Grammar

Countable and uncountable nouns

http://www.english-room.com/grammar/countable_uncountable.htm
http://a4esl.org/q/j/km/mc-noncount.html
http://www.carmenlu.com/first/grammar/countable1_1.htm
https://www.myenglishpages.com/site_php_files/grammar-exercise-countable-uncountable-nouns.php

Adjectives + preposition

https://www.english-4u.de/en/grammar/adjectives-prepositions.html    rules and 3 exercises
https://www.ecenglish.com/learnenglish/lessons/adjective-preposition-challenge
https://test-english.com/grammar-points/b1/adjective-preposition/  

Articles
https://www.englisch-hilfen.de/en/exercises/nouns_articles/a_the.htm
https://www.englisch-hilfen.de/en/exercises/nouns_articles/a_the_2.htm