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Ответ от Елена Ананченко[гуру]
1. Ringing him up is useless: at this time he is always out.
2. Seeping in the open air is very useful.
3. He is not only a good singer but also a wonderful actor; he is worth listening to in the opera.
4. There is no use in making a brake; there is work only for half an hour. (Здесь сомневаюсь)
5. Crossing the river in this place is very dangerous.
6. When after long lifting you reach a mountain top, you have a feeling of extraordinary satisfaction.
7. Argueing with him is a waste of time.
8. Meeting with old friends is so pleasant!
9. Listening to his stories means to endure exciting events of those days once more.
10. I don't see any logic in it; in my opinion, it is like putting a cart ahead of a horse.