[2013·安徽卷] From space, the earth looks blue. This is ________ about seventyone percent of its surface is covered by water.
. The Foreign Minister said, “________ is our hope that the two sides will work towards peace.”
. Meeting my uncle after all these years was an unforgettable moment, ________ I will always treasure.
. While teaching students, teachers should take into consideration _________ students develop at different rates.
. The reason ________ he referred to for his success is ________ he always working hard.
. A little learning is not dangerous so long as you know ________.