QUES: Continue writing.

Chemistry class was hard for Jessica but not Sarah because 
+++++++++
ANS: Sarah loved studying sciences in school.


QUES: Continue writing.

John and Jim's bodies were unable to get rid of the parasites, because the 
+++++++++
ANS: parasites were so strong.


QUES: Continue writing.

Joel was really very good at hockey whereas Adam was not because 
+++++++++
ANS: Adam was very lethargic.


QUES: Continue writing.

The professor preferred to demonstrate the problem on a chalkboard rather than a projector, because the 
+++++++++
ANS:
projector was less effective.