i know!
, {; t. [6 O9 C7 R& ]& S4 @when they can have 15 mins discussion.5.39.217.77:8898- g* w Y3 Z i
make 1 of them to do a specific job whcih is counting
* n O0 c1 \; [* Qonly him can turn on off off the light.公仔箱論壇" b$ ~# c, z, H# e. @
Basically, if you are the first time to get in the room, turn on the light,
) _ { l2 y* `3 Qtvb now,tvbnow,bttvbthen wait for "the special man" to turn the light off....
* i" m% x0 \" W! Qwhen "the special man" count in up to 30 (included himself)5.39.217.77:88988 I: _$ l7 `2 y! v
then it is done! |