12. which one of the following sentences correctly uses a comparative adjective?
george has a bigger appetite than harry.
b. this is the worse picture i've ever seen.
c. alicia is a gooder swimmer than marilynn.
d. of the three girls, janet is the better speaker.

Determine the meaning of the word *propel* using the context clues in the sentence. wind power is the ability to capture the wind in a way to *propel* the blades of wind turbines. a) to move slowly b) to urge onward c) to stop from moving d) to drive, or cause to move, forward