The _____ flight CA9525 for 11∶30 a.m．is to be put off due to the stormy weather．

A．ordinary                  B．common         C．formal                D．regular

The ________ flight CA9525 for 11∶30 a.m.is to be put off due to the stormy weather．

1. A.
   regular
2. B.
   formal
3. C.
   common
4. D.
   usual