____ are being done to test new medicines. A key-ring is a ____ for keeping your keys together. Frogs like to hide in the grass at the side of a ____ When you ____ the switch, the computer starts. A long time ago, people wrote on ____, not paper. The development of writing 8,000 years ago was a great ____ You need a lot of ____ to go rock climbing. My dad wants to ____ a house next to that lake.

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