Themselves.
The cue here is fight. Since the fight verb presents itself as plural then we should use themselves to satisfy correctly the sentence. Moreover, the use of itself is when the subject is singular.
For example,
The chair moved by itself which was a spooky gesture.
Answer:
The four seasons, winter, summer, autumn and spring fly by like Lightning Mcqueen from the movie Cars, racing to the finish line. When you talk about the seasons everybody has a different perspective to it. Some might say summer is the best, due to there being no school, also the hot weather. Many may argue that Spring is the best, because of the plants coming back to life after months in the grave, but in my opinion, summer is the best season. in summer, you get a chance to swim since it is so hot outside, you get to have fun since there is not school. I really enjoy the warm weather because it's the perfect atmosphere to do outdoor activities. ... During summer, you're free to do whatever you want, not worrying about curfew or waking up early for school.
