Which sentence is a simple sentence?
a. her house is white; his is brown.
b. until last week, i had never ridden on an airplane.
c. as the car rounded the curve, it suddenly flipped over.
d. i like to swim, but i don’t like to swim in the ocean.
is it b?

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)

Which part of the original work should the adaptation retain

Is the group of words a simple sentence, a compound sentence, or a run-on sentence? jan went on a quiz show, won two hundred dollars, and bought gifts for her family. a. run-on sentence b. compound sentence c. simple sentence