I always did well in that topic, but I alway struggled in the other subject, because the 
OPTIONS:
- topic was a lot harder.
- subject was a lot harder.
subject was a lot harder.

Steve got more bites on his legs when he wore shorts than pants because the 
OPTIONS:
- pants exposed his legs.
- shorts exposed his legs.
shorts exposed his legs.

Benjamin wore head and wristbands during sports, but not Joseph because 
OPTIONS:
- Benjamin produced very little sweat .
- Joseph produced very little sweat .
Joseph produced very little sweat .