There were rapid changes in the condition of the patient after receiving the treatment.
"The city's infrastructure is its buildings, facilities, and its government." "The infrastructure of the company did not support the rapid changes needed for its success."
no
The dog's rapid movements made him very difficult to catch.
The Industrial Revolution was a rapid change in the economy!
The boy rapidly threw the ball. Except that's "rapidly". A use of "rapid" would be, "The rapid current carried away my pocketwatch."
rapid
use "that" when the meaning of the sentence changes. Sometimes "that" can be left out of the sentence. Never use a comma with "that". Use "which" when the meaning of the sentence does not change. Always use a comma with "which".
to consider the rapid changes in social media
Rapid pressure changes will transmit as a sound wave.
Our lightrail is a good form of rapid transit.
I did not get A answer to my Q
Technology can improve speed and efficiency in many fields. It is difficult for many older Americans to adapt to the rapid changes in technology. Advanced technology makes it possible for aircraft to practically fly themselves.