完形填空。 Who invented music? Who sang the first song? No one 1 exactly (准确地) the answers to these questions. But we know that music is very 2 in everyone's life. Babies and young children would like someone 3 to them. When they get older, they like to 4 songs themselves. When children go to 5 , their world of music grows wide. In middle school, students 6 music lessons. And they become 7 in pop music. It will make 8 happy. We can 9 hear music in other places such as shops and bars and so on. That's because that music can help people relax after 10 hard work. We couldn't imagine that without music what our life would be like. (    )1.   A. makes (    )2.   A. enough (    )3.   A. sings (    )4.   A. talk (    )5.   A. bed (    )6.   A. make (    )7.   A. interested (    )8.   A. us (    )9.   A. too (    )10. A. a day B. knows B. important B. singing B. sing B. shop B. teach B. interesting B. you B. also B. days C. keeps C. classical C. to sing C. listen C. school C. take C. happy C. them C. either C. one-day's D. leaves D. simple D. sang D. dance D. picnic D. hate D. careful D. him D. never D. a day's