i know!公仔箱論壇3 ~4 T$ S9 _ C' s& I
when they can have 15 mins discussion.5.39.217.774 O. F0 U& O2 g N% u6 s
make 1 of them to do a specific job whcih is counting
0 z' U2 q7 s* T* Q# ]( Itvb now,tvbnow,bttvbonly him can turn on off off the light.公仔箱論壇! C7 G) H) O0 y2 v
Basically, if you are the first time to get in the room, turn on the light, - N& u0 i% Q) |: H# l. J
then wait for "the special man" to turn the light off....tvb now,tvbnow,bttvb% J! @0 m5 Q; }" Z7 B- F
when "the special man" count in up to 30 (included himself)5.39.217.778 L. s! t; A: _% _
then it is done! |