What are biofuels? 1. The use of biological material (biomass) as a fuel or lighting material is not new; the earliest evidence for humans using wood for fires is at Gesher Benot Ya'aqov in Israel, 790,000 years ago. However, concern over the impact that the burning of fossil fuels is potentially having on the climate has resulted in renewed interest in biofuels. The difference between fossil fuels and biofuels is that fossil fuels were produced millions of years ago when plants and other organisms died, became buried and were subjected to high temperatures and pressures forming coal, oil or natural gas. Biofuels, on the other hand, are produced from biological material that has been living recently. There are a number of ways in which biofuels can be produced.

Uzeyir Hajibeyov is a great composer, a classic of Azerbaijani musical culture, whose work played a fundamental role in the history of the national musical art. With the name U.Hajibeyov is associated with the formation and development of professional musical creativity in Azerbaijan, the emergence and evolution of many genres, the creation of a number of professional collectives. U. Hajibeyov was the first to start composing and public activities in difficult conditions of life, created the national musical theater throughout the Middle East. U becomes an active participant in the construction of Azerbaijani culture.Hajibeyov. Later, he creates his best works, opening new pages in the national art. The author of the first operas, musical comedies, mass songs, gazelles, cantata and oratorio music, works for the orchestra of folk instruments, as well as the first Azerbaijani classical opera-a masterpiece of Azerbaijani musical art - "Ker-ogly", - U.Hajibeyov played an outstanding role in the development of national culture and as a public figure, playwright, scientist, folklorist, teacher. In all areas of its multi-faceted activities

Узеир Гаджибеков - великий композитор, классик азербайджанской музыкальной культуры, творчество которого сыграло основополагающую роль в истории национального музыкального искусства. С именем У.Гаджибекова связано становление и развитие в Азербайджане профессионального музыкального творчества, возникновение и эволюция многих жанров, создание ряда профессиональных коллективов. У.Гаджибеков был первым, кто начав композиторскую и общественную деятельность в тяжелых условиях жизни, создал на всем Ближнем Востоке национальный музыкальный театр. Активным участником строительства азербайджанской культуры становится У.Гаджибеков. Позже он создает лучшие свои произведения, открывающие новые страницы в национальном искусстве. Автор первых опер, музыкальных комедий, массовых песен, газелл, кантатно-ораториальной музыки, произведений для оркестра народных инструментов, а также первой азербайджанской классической оперы-шедевра азербайджанского музыкального искусства - "Кёр-оглы", - У.Гаджибеков сыграл выдающуюся роль в развитии национальной культуры и как общественный деятель, драматург, ученый, фольклорист, педагог. Во все сферы своей многогранной деятельности

1. Mike could run very fast five years ago.

Mike couldn't run very fast five years ago.

Could Mike run very fast five years ago?

2. They can understand French.

They can't understand French.

Can they understand French?

3. Kate could speak English well when she was ten.

Kate couldn't speak English well when she was ten.

Could Kate speak English well when she was ten?

4. My brother can come and help you in the garden.

My brother can't come and help you in the garden.

Can my brother come and help you in the garden?

5. His little sister could read when she was five.

His little sister couldn't read when she was five.

Could his little sister read when she was five?

6. The children can carry this box.

The children can't carry this box.

Can the children carry this box?

7. My Grandma can cook very well.

My Grandma can't cook very well.

Can my grandma cook very well?

8. Jessica could dance tango.

Jessica couldn't dance tango.

Could Jessica dance tango?

9. I can answer the questions.

I can't answer the questions.

Can I answer the questions?

10. I can afford this trip.

I can't afford this trip.

Can I afford this trip?

11. Sally could speak well on the telephone

Sally couldn't speak well on the telephone

Could Sally speak well on the telephone?

. 12. Peter Green can find a good job.

Peter Green can't find a good job.

Can Peter Green find a good job?

13.Bill will be able to meet you at the airport tomorrow.

Bill won't be able to meet you at the airport tomorrow.

Will Bill be able to meet you at the airport tomorrow?

14. They will be able to finish the project before Christmas.

They won't be able to finish the project before Christmas.

Will they be able to finish the project before Christmas?

15. You will be able to find my house.

You won't be able to find my house.

Will you be able to find my house?

16. Linda will be able to join us today.

Linda won't be able to join us today.

Will Linda be able to join us today?

17. We will be able to stay with you for two weeks.

We won't be able to stay with you for two weeks.

Will we be able to stay with you for two weeks?

18. Peter and Paul were able to go to the football match yesterday.

Peter and Paul weren't able to go to the football match yesterday.

Were Peter and Paule able to go to the football match yesterday?

19. My sister was able to pass her English exam last week.

My sister wasn't able to pass her English exam last week.

Was my sister able to pass her English exam last week?

20. Oliver was able to recognize his aunt and uncle at the airport.

Oliver wasn't able to recognize his aunt and uncle at the airport.

Was Oliver able to recognize his aunt and uncle at the airport?