The infection blocked his nasal passage, but the medicine cleared it up, the 
OPTIONS:
- infection was voracious against it.
- medicine was voracious against it.
medicine was voracious against it.

She was good at makeup but terrible at haircare - she thought the 
OPTIONS:
- haircare industry was exciting.
- makeup industry was exciting.
makeup industry was exciting.

The teachers tried to fit all the books into the schools but the 
OPTIONS:
- schools were too small.
- books were too small.
schools were too small.