i know!tvb now,tvbnow,bttvb6 S3 L' r: w" J
when they can have 15 mins discussion.5.39.217.77# N [0 R/ w# a1 d. X; U3 i
make 1 of them to do a specific job whcih is counting
5 V1 B# S3 p) u2 O' qonly him can turn on off off the light.; l+ G& o9 K# J. N3 w% N+ I
Basically, if you are the first time to get in the room, turn on the light, # a1 W3 O" }* H, d% b& y7 V
then wait for "the special man" to turn the light off....公仔箱論壇% T+ m; q; i1 F9 i. V3 r* E; o
when "the special man" count in up to 30 (included himself)tvb now,tvbnow,bttvb- s+ U' N! v1 h4 c% Z
then it is done! |