If only tears ____ laughter.

People are born blind and deaf can exhibit laughter.

r______ come up with sudden laughter

All of them were shaking（）laughter. A: over B: through C: with D: by

The cues that trigger laughter have been studied by scientist.

Doctors have proved the following EXCEPT that （） A: smiling does good to health B: laughter can be tolerated C: there is a way to reduce pain D: laughter can work the muscles in the feet

Doctors hold laughter clinics（） A: to give better condition to their patients B: in order to improve patients' health C: to make patients smile D: to prove smile and laughter have the same effect

The purpose of doctors holding laughter clinics is ______. A: to give better condition to their patients B: to improve patients' health C: to make patients smile D: to prove smile and laughter }lave the same effect

It has been proved all of the following except that ______. A: smiling does good to health B: laughter can produce pain C: there is a way to reduce pain D: laughter can work the muscles in the feet

He could no longer________his laughter.? hold against|hold up|hold back|hold onto