Angela had a common cold as opposed to Natalie who was very sick, so
OPTIONS:
- Angela took strong medicine.
- Natalie took strong medicine.
Natalie took strong medicine.

Christopher has a successful business but Adam has a business that failed as
OPTIONS:
- Christopher is a hard worker.
- Adam is a hard worker.
Christopher is a hard worker.

He tried to cut the slate with a knife but it didn't work because the
OPTIONS:
- slate was so dull.
- knife was so dull.
knife was so dull.