Make a list each day of all that you are grateful for, ______(这样你就能每天都注意到从别人那里得到了什么).

A．Every year, Chicago spends about $ 4,000 on cooling the city.
B．The design of the garden on the City Hall specially takes into consideration the weight the roof can stand.
C．The Mayor urged the environmental department to look into rooftop gardens in Hamburg and build similar ones in America.
D．Heat islands mainly refer to those dark-colored rooftops which receive and retain heat and will not easily release the heat.