_________that developed countries want to limit the development of the developing countries in the climate conference in Copenhagen.

I usually_______ books in the morning.

I have learned English _____ two years.[ ]

I think ____ of the materials I listened to at the beginning of the exam ____ easy.

You always spend only a little time on your study. You really ____me down.— I’m sorry, Mum. I won’t do that again.