Listen to the (second part) of the conversation. Which ideas do the speakers talk about? Check the ideas they all agreed to do.
选项：

A:replacing the light bulbs
B:using solar energy
C:buying a new refrigerator
D:eating cold food more often
E:not using the clothes dryer
F:not using the hair dryer G:keeping track of their energy use H:taking shorter showers I:turning the computers off at night