We should not laugh _________ the poor.
We should not laugh _________ the poor.
Explanation
Laugh is an intransitive verb.
Laugh at someone means کسی پر ہنسنا یا مذاق اڑانا
Laugh is generally followed by at
We should not laugh at the poor means ہمیں غریبوں پر نہیں ہنسنا چایئے