Writing was probably the most revolutionary of all human________
The 15th-17th centuries were the time of great geographic _______
Who ... the computer?
When did they ...oil in the North Sea?
Australia was ... for Europeans by James Cook.
The mobile telephone is a wonderful ...
We ... recycle things to get rid of garbage.
People ... kill the African elephant for its tusks.
One ton of recycled paper ... save 17 trees.
... is the study of things that occur naturally such as heat,
light, sound, electricity, magnetism, etc.
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