Subject vs Object questions

1. Complete the questions with the right question word:
http://learnenglish.britishcouncil.org/en/grammar-exercises/question-forms-subjectobject-questions

2. Choose the right question
http://www.esl-lounge.com/student/grammar/3g26-subject-object-questions.php

3. Write questions for the answers provided:
http://www.english-zone.com/grammar/questions4.html

4. Make subject or object questions:
http://www.perfect-english-grammar.com/subject-questions-exercise-1.html