1. He sat in a comfortable armchair (smoke) a cigarette. 2. (put) aside the newspaper, she raised her eyes at me.
3. We watched the delegation (show) into the hall.
4. (visit) the museum before, I knew my way easily.
5. (rise), THE SECRETARY PUT DOWN THE NEWSPAPER.
6. ( stop) before the traffic lights, he saw to his surprise it was almost 8 o’clock.
7. (work) as a taxi driver for 20 year, he knew every little corner of the town.
8. She stayed (lock) in her room, (refuse) to come downstairs.
9. The boy on the fence looked like a swallow, (perch) on the telephone wire.
10. They went out as they had come, (see) by no one on the way.
11. He looked at the scene (shake).
12. He introduced me to a friend, recently (arrive) after a cruise around the world.
13. (reject) by the editorial board, the story was returned to the author for revision.
14. (wait) in the reception room, he thought over what he would say when he was asked into the office.
15. They reached the peak at dusk, (leave) their camp with the first light.
16. They put up for the night a temporary camp, (leave) it at dawn.
17. (write) in an archaic language, the book was difficult to read.
So why did a change in climate 36,000 years ago drive the Siberian unicorn extinct, but not the woolly rhinoceros or the saiga?
To answer this question, our study took fossil bones from the Siberian unicorn, woolly rhino, and saiga, and looked at the nitrogen and carbon they contained — as differences in these elements reflect an animal's diet.
We found that before 36,000 years ago the saiga and the Siberian unicorn behaved very similarly, eating grass almost exclusively. After this point, the carbon and nitrogen in saiga bones showed a major dietary shift towards other plant types.
But shifting from a grass diet proved too difficult for the Siberian unicorn, with its special folded wear-resistant teeth and a low-slung head right at grass height.
Relatives such as the woolly rhino had always eaten a more balanced array of plants, and were much less impacted by a change in habitat.
Importantly, the change in climate that drove the Siberian unicorn extinct was actually much less pronounced than those which occurred during the Ice Age that followed. Or the changes that we will face in the near future.
The story of the Siberian unicorn is a timely reminder that even subtle changes in plant distributions can have devastating knock-on effects for large animal species.
Legends of the unicorn, or a beast with a single horn, have been around for millennia.
Some have argued that the horn of the rhino may have been the basis of myths about unicorns, although other animals - such as the tusked narwhal - are more likely contenders.
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