____ a strong and fair climate agreement at the key UN summit in Copenhagen, 50,000 people in London wore blue and went to the streets.
. It is still unclear ______ the little boy got the CD player to work.
----Did Susanna visit you again ______ next year? ----No, it was almost ten years before she came to see me ______ second time.
A huge _____ of quilts was needed in Qinghai province since it was freezing at night.
. _____ can be enjoyed until you have a deep understanding of the low-carbon lifestyle.
If you _____ the meeting place in greater detail, I _____ so much time looking for it.