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The man could not _______ working twelve hours a day.
Our _______ is changing due to human actions.
Is ______ warming the cause of climate change?
Courtney found a ______ on the beach.
Humans can ______ the amount of trash we make.
The energy used in this house is from the _____ panels.
The __________ effect is the warming of the Earth caused by the atmosphere acting like the glass of a __________.
Fossil _____ are a limited resource.
Save waste and _______ all your glass.
Air _________ is bad in many cities.