Нужно вставить в present perfect или present perfect continuous
1. Many people believe that our climate (change) very markedly. 2. I (collect) the pictures with bridges since I graduated from the University. Now I (collect) enough to organize an interest¬ing exhibition. 3. She (read) a fairy tale to the children since breakfast. They (not/finish) yet. 4. Those people (wait) for a tram for the last fifteen minutes. I'm afraid, they don't know that the electricity (go) out. 5. What (happen) to Mary? John (ring) her up the whole evening and nobody (answer). 6. "You (come) out at last," he said. "Well, I (stand) here long, and (listen) to the nightingale." 7. So, you (arrive). We just (speak) of you. 8. "How long you (know) about it?" - "I (know) it all the time. 9. "Why you (turn) off the music?" - "I (play) the records for hours; I'm tired now." 10. I definitely (decide) to give Pendle up.

have changedhave been collectinghave collectedhas been readinghaven't finishedhave been waitinghas gone outhas happenedhas been ringinghas answeredhave comehave been standinghave been listeningдалее по аналогии8 PP, PP9. PP, PPC10 PP