Recognized as ________ world cultural heritage by the United Nations in 2002, paper cutting is ________ practice which originated in ancient China.
Some people have the idea_____ you can cross Canada in less than five days.
Only after her mother came to help her for the first few months ______ to begin her project.
Thanks to Dr Yuan’s research, the UN has more tools in the battle to rid the world _____ hunger.
______ is even more important is that the earth cooled down, water began to appear on its surface.
Jane _____ these families of chimps for many years and helped people understand how much they behave like humans.