“Power sleeping” for more hours on weekends is only a _______ solution. There is no substitute for getting a good night’s sleep on a regular basis.

1 didn’t know ______ they got to know each other．

Xiao Ming _______singing to dancing.

The worker keep_______ in order to make money for their living

During the 1950s，R&Bchanged modern music further and led to＿＿＿＿we know asrock and roll