Ответ:

1.  What is graffiti?  Graffiti  is a street art.

2. When did modern graffiti begin? Modern graffiti began in the 1970s.

3. Modern graffiti began in  New York or London? Modern graffiti began in New York.

4. Who wrote names in pen on walls around the city? Young people wrote names in pen on the walls around the city.

5. Who was the one of the first "taggers"? Teenager called Demetrius was one of the first "taggers".

6. What was Demetrius's tag? His tag was TAKI 183.

7. Demetrius wrote his tag on the walls or on the windows? He wrote his tag on the walls.

8. When did aerosol paint graffiti become very popular? It became popular in the 1970s and 1980s.

9. Where did aerosol paint graffiti appear? It appeared on the walls, buses and trains all over New York.

10. Teenagers' tags were colorful, weren't they?  Yes, they were.

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