QUES: Continue writing.

Because lactose intolerance causes unpleasant symptoms like gas, and Eric suffered from this while Kyle did not,
+++++++++
ANS: Eric consumed very little dairy.

QUES: Continue writing.

Rebecca was under the car changing the oil while Laura watched, since
+++++++++
ANS: Rebecca was handy with cars.

QUES: Continue writing.

Justin didn't enjoy stargazing like Ryan because
+++++++++
ANS: Justin lived in an area with smoggy air.

QUES: Continue writing.

Natalie really enjoyed eating all sorts of foods unlike Rebecca because
+++++++++
ANS:
Natalie was really adventurous.