http://first-english.org/english_learning/english_beginners/there_is_there_are/06_is_there_are_there_questions_exercise.htm
http://www.agendaweb.org/exercises/grammar/there-is-there-are.htm
http://www.englisch-hilfen.de/en/exercises/various/there_is_there_are.htm
http://www.englisch-hilfen.de/en/exercises/various/there_is_there_are2.htm QUESTIONS
http://first-english.org/english_learning/english_beginners/there_is_there_are/04_there_is_there_are_exercises.htm