根据短文内容，从下面方框中选择适当的单词或短语填空，使短文内容完整正确，并将答案填写在答题卡标号为1~5的相应位置上。

know          climate          stay off           took part        grown into

 
The lights in many buildings around the world were turned off at 8: 30 p．m．on March 29^th, 2014．The lights ________ for one hour an event called Earth Hour．The event is organized by the World Wide Fund for Nature, also ________ as the World Wildlife Fund．People are asked to turn off their lights for one hour to call attention to _ change,
The first Earth Hour was held in 2007 in Sydney, Australia．Since then, Earth Hour has ____ an international event．People in more than seven thousand cities in one hundred and fifty countries _____ this year．The event organizers say big changes start with small steps like turning out the lights．