— Thank you for your wonderful meal. —______.
It is suggested that the key _______ the world's environment should be _______ a low carbon economy right now.
This washing machine is environmentally _______ because it uses less water and electricity than older models.
AII the companies had to _______ their expenses in response to the financial crisis.
In the new term,I'd like you to know the three different _______ to the study of math.
As you know, the output of cars in 2010 is five times _______ it was in 2000 in the factories across our country.