TASK DEFINITION: Given a sentence, generate a new sentence by performing small changes on the sentence. Here, make sure that the changes are semantically related and syntactically similar to the input. And the generated sentence should have high commonsense plausibility, that is to have reasonable probability of it being true.
PROBLEM: Cash can be used to make purchases at most books .

SOLUTION: Cash can be used to make purchases at most warehouses .

PROBLEM: It is a technique to withhold or absorb certain drugs .

SOLUTION: It is a crime to possess or cure certain drugs .

PROBLEM: You can use a classroom to learn a connection .

SOLUTION:
You can use a classroom to learn a subject.