A、wE wAnt to mAkE othErs lAugh, too.
B、wE wAnt to AppEAr optimistiC in puBli
C、
C、
A、FAkE smilE or lAugh will ChAngE into A truE lAugh.
D、our BoDiEs CAn BE FoolED EAsily By An ACt oF lAughing.