It is not okay to eat while on a fast. (abstaining from eating)
That boy can run fast. (very quickly)
a car whiz so fast.
Rate is a word used to measure something. A good sentence would be, her rate of typing was super fast.
With a fast flowing river, hydroelectric power can be generated.
As another deadline loomed he worked as fast as he could.
The urbanization in Mexico city has grown very fast. This is a sentence containing the word urbanization.
The monk was told to fast before mattins. The cheetah ran too fast for him to catch.
I am not writing a sentence using that word.
I can give you a sentence using the word galaxy.
a sentence using the word endotracheal
This is a sentence using the word aviator.
My Reaction Time was fast because i was paying attention to my teacher with Nina B.
By using it in a present type sentence. Ex: I reform my broken puzzle piece by piece.