16. I havn't seen my cousin since last year.
17. Why did you put these things in the wrong place?
18. Why have you left the door open? You will catch cold sitting in the draught.
19. "We haven't met for such a long time!" said my friend. "Yes, indeed," I answered, "and we both have grown."
20. What books did you read when you lived in the country?
21. They haven't come from the south yet.
22. He was ill last week, but now he has recovered.
23. If everybody has read this new novel, let's discuss it.
24. Have You booked tickets? Yes, I ... . I booked them several days ago.
25. I can hardly recognize you. I haven't seen you since you left for Moscow. And you've changed so much.