The standard alternating bass line for a C chord is between the C note on the third fret of the fifth string and the E note on the second fret of the fourth string.
Once again use the notes from the C Major and Blues scales for the melody.
Example Thirteen uses a C Major with a C seventh chord.
Example Fourteen uses two extra notes on the second string.
Example Fifteen adds the top G note on the first string.
Example Sixteen uses the F note on the first string as well as the other notes in the previous three exercises