Решение #
1. Many animal species have disappeared.
2. Our government tries (is trying) to control crime.
3. Your mathematics is getting better and better.
4. There are thousands of bird species in the world.
5. The public is (are) concerned about it.
6. Many people have already signed the petition.
7. Acoustics is the subject that I know very little about.
8. Nowadays people have many more belongings than before, but the police in many countries have become much busier.
9. Physics is the subject that is preferred by boys rather than girls.
10. Fashionable clothes have become very expensive now.
11. The committee begins (is beginning) its work in September.
12. I don’t know where the contents are in the book: on the front or on the back page.
13. There was ash in the fireplace.
14. Our company’s headquarters are in Moscow.
15. The military are here (have arrived).