1. Hip hop is an American cultural movement _______ started in the 1970s at block parties in New York.

A. when¡¡¡¡¡¡¡¡B. where¡¡¡¡¡¡¡¡C. which¡¡¡¡¡¡¡¡D. who

2. This is a technique _______ by DJs in Jamaica.

A. used¡¡¡¡¡¡¡¡B. using¡¡¡¡¡¡¡¡C. to use¡¡¡¡¡¡¡¡D. use