ADVERBS ----- HOW LONG

http://www.ihbristol.com/free-english-exercises/test/esol-smc-adverbs-how-long

PRESENT PERFECT ---- FOR and SINCE

http://www.eclecticenglish.com/grammar/PresentPerfect1D.html

Intermediate grammar exercise: past simple and present perfect questions with ‘how long’

http://speakspeak.com/english-grammar-exercises/intermediate/past-simple-and-present-perfect-questions-with-how-long

THE HOUSE OF BERNARDA ALBA

Understanding the American Education System

http://studyusa.com/en/a/58/understanding-the-american-education-system

The American Education System

http://studyusa.com/en/a/58/understanding-the-american-education-system