This piece of music is worth __________.

A. to listen                       B. to listen to                    C. listening            D. listening to

 This piece of music is worth __________.

A. to listen    B. to listen to      C. listening      D. listening to

This piece of music is worth __________.

A. to listen                  B. to listen to              C. listening        D. listening to

 I think this piece of music is  worth_______.

A．listening                              B．to be listened to

C．listen to                               D．listening to

This piece of music is worth __________.

A．to listen                              B．to listen to

C．listening                              D．listening to