http://www.perfect-english-grammar.com/present-perfect-exercise-5.html
https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises
http://www.englisch-hilfen.de/en/complex_tests/present_perfect1/index.php
The articles
http://www.englishpage.com/articles/a-vs-an.htm
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