Кислород и озон — аллотропные модификации, так как эти вещества:

1. I never take part in any competitions.

2. Sometimes I win the competition.

3. If you don't believe in your luck, you can miss a very good chance.

4. I'm afraid he has already missed his chance.

5. Every leaf means a lucky month in the next year.

6. What gave a new beginning to the history of long distance communication?

7. Does she mind his travelling by air?

8. Is she going to give up playing tennis?

9. I hope to win the Round-the-World tour.

10. I think computers are waste of time because children become nervous, angry and tired.