Listen!The piece of music sounds great.请详解一下为什么用sounds,而不是sound?

listen,the piece of music____(sound)so nice是填is sounding吗?sound是什么词? Listen!The piece of music sounds great.请详解一下为什么用sounds,而不是sound? the piece of用法 ______ this piece of music,pleasea)listen to b)hear a piece of the American the best piece of advice a piece of beautiful music()to listen还是to listen to listen ,the piece of music ______(sound) so nice.I'd like the blue dress _____(which has) flowers on it What's in the piece of chocolate? ( )the piece of paper 填什么介词? 请问a piece of the American Smile always hid inside the piece of go a piece of the way go a piece of the way piece of piece of [ ]down your phone number on a piece of paper. A Look B Be C Listen DWrite The students taking part in the contest will listen to part of a song or a piece of music这是一道短文改错题，这一段的错误应该在哪里？请帮我找出来，然后写上正确答案，