Проверьте 5 типов вопросов на англ. яз, исправьте ошибки, пожалуйста.

1. Was the word "jazz" so firmly planted in the public mind that the decade of the 1920s was known as the Jazz Age?
2. Is rock music popular not only in the United States, but also Western Europe or throughout the world?
3. Who was the best known rock'n'roll singer?
4. Ragtime was the first "black" American music to gain popularity, wasn't it?
5. Jazz originated in the South, but its capital wasn't New Orleans, is it?