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: You can accept or vary the lyrics of a song .

SOLUTION: You can audio or read the lyrics of a song .

PROBLEM: You would invest kind or energy because you appear to make more money .

SOLUTION: You would invest money or care because you want to make more money .

PROBLEM: boys drink cow 's milk .

SOLUTION:
People drink cow's milk.