Prepositions of Place - Practice

http://www.perfect-english-grammar.com/prepositions-of-place-exercise-1.html

http://speakspeak.com/english-grammar-exercises/intermediate/prepositions-of-place-at-in-on

Question Forms - Practice

http://www.grammar.cl/Games/Question_Words.htm

http://www.grammar.cl/Games/Question_Words_2.htm

http://www.grammar.cl/exercises/question-words.pdf

http://www.myenglishpages.com/site_php_files/grammar-exercise-wh-questions.php

Simple Past, Past Continuous, Used To- Practice

http://www.grammar.cl/Games/Past_Irregular_Verbs.htm

http://www.perfect-english-grammar.com/past-simple-exercise-7.html

http://www.perfect-english-grammar.com/past-simple-exercise-8.html

http://www.perfect-english-grammar.com/used-to-exercise-1.html

http://www.perfect-english-grammar.com/used-to-exercise-2.html

http://www.perfect-english-grammar.com/used-to-exercise-3.html