. —Would you like to come to dinner tonight? —I’d like to, ___ I’m too busy.
ln the struggle of fighting against _______ nature, _______ man created itself.
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.