A2 Present perfect + since/ for

http://www.ejerciciodeingles.com/present-perfect-for-since/
http://www.isabelperez.com/happy/tenses/pres_perfect.htm
http://www.angelfire.com/on/topfen/testsforsince5.html
http://www.isabelperez.com/happy/tenses/exercises/present_perfect_1.htm