Recently the world has witnessed several horrifying terrorist attacks. They happened on different continents and in different countries. Can you say when and where some of them took place? What was the people's reaction? Why do you think such attacks occur? Who or what is to blame? How can terrorism be stopped?

1. He has just ( finished) his work. 2. Have you ( made) any spelling mistakes in your dictation? 3. What books did you ( read) when you ( lived) in the country? 4. They (have not yet come) from the south. 5. He (was) ill last week, but now he (has recovered). 6. If everybody (has read) this new novel, let's discuss it. 7. Have you ( booked) tickets? — Yes, I have. I ( booked) them several days ago. 8. I (have not  seen) you since you ( left) for Moscow. 9. Have you ( read) all the books on this shelf? 10. I (have not seen) my cousin since last year. 11. Why did you ( put) these things in the wrong place? 12. Why have you ( left) the door open?