laugh
                    - Don’t laugh_____ people in trouble.[ ]
 - Don’t laugh ____ him, he only made a small mistake. [ ]
 - It is impolite to_____those persons in trouble.[ ]
 - This novel can make you laugh and cry at _____ same time.
 - This novel can make you laugh and cry at _______ same time.
 - Why did you laugh just now?— John wanted to tell usvery funny joke, but he forgotend himself.
 - Don’t ______ others when they make mistakes.
 - It is not polite tothose persons in trouble.
 - It’s impolite_____ others.