题目内容：

阅读下面材料，在空白处填入1个适当的单词或括号内单词的正确形式。

Among all kinds of music, pop music is my favorite.1.originated (起源) in Britain and2.(perform) by such3.(artist) as the Beatles, the Rolling Stones. Abba, and so on. Pop music has an interesting development. 1960s and 1970s saw4.great number of important changes in5.(popularity) music, for example,6.(develop) of a number of new styles. I think pop music can not only help relax pressure in daily life,7.express our feeling,8.(much) easily sometimes. To my delight, pop music nowadays has deepened9.(it) to carry more meanings,10.(pay) more attention to social issues.