Very, very easy! this kind of is a homework question since i'm writing an essay right now.
ok, so what is better?
1. the soldiers on opposite sides were firing guns at each other
2. the soldiers on opposite sides were shooting each other.
3. or something else.
i want to write 1 the most but does it make sense?

Aids is growing fastest in the poorest countries of africa. these nations don’t have enough doctors, medical labs, or money for medicine. a recent study showed that only a small percentage of hiv-infected children in africa are getting any medical treatment at all. what central idea is emphasized in both sources? the hiv/aids epidemic in africa is serious. the hiv/aids epidemic in south africa is serious. the hiv/aids epidemic among african children is serious. the hiv/aids epidemic among south african children is serious