Day 57. Present Perfect

Hello, chaps! Today we will deal with the exercises based on Present Perfect. Actually, what do you remember from the prevoius lesson?
http://www.englishpage.com/verbpage/presentperfect.html
http://www.agendaweb.org/verbs/present_perfect-exercises.html
https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple