Review present perfect / past simple

- Present perfect
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises
http://www.ego4u.com/en/cram-up/tests/present-perfect-simple-1
- Present perfect or past simple
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/tests?test1
- just / yet / already / ever / never
http://www.grammarbank.com/ever-never-just-already-yet.html