undoes

"Fortunately, the rain stopped just before the picnic started. "

"The reverse of a failing grade is a passing grade. "

"The teachers at my school are very helpful and care about their students. "

"The constant noise from the construction site made it hard to concentrate on my homework. "

"Her credibility as a teacher suffered when she repeatedly canceled classes without notice. "

"Many economic and political reasons led to the downfall of the Roman Empire."

"John and I have been friends ever since we were roommates at college.   Trust is important between friends.   I used to find it hard to make friends when I was shy."

"Please do not include any additional information or instructions. Unfasten your seatbelt when the car stops. "

"High medical bills can impoverish a family very quickly. "

"The effect of the hurricane was a devastated landscape."

"My sister's reputation for being organized helped her excel in school. "

"The student's action of studying diligently improved her grades. "