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: Many types of bat use control insects .

SOLUTION: Many strategies of bat help gut insects .

PROBLEM: You would extend the bills because you want services or concessions .

SOLUTION: You would utilize the applications because you want services or goods .

PROBLEM: You are prone to find a passenger terminal in an airport .

SOLUTION:
You are likely to find a passenger terminal in an ER .