prepositions-exercises

http://www.myenglishpages.com/site_php_files/grammar-exercise-prepositions.php
http://www.englisch-hilfen.de/en/exercises/structures/prepositions_place_time.htm
https://www.ego4u.com/en/cram-up/grammar/prepositions/exercises
https://www.ego4u.com/en/cram-up/grammar/prepositions/exercises?02
https://www.ego4u.com/en/cram-up/grammar/prepositions/exercises?18