1.Scientists ____ experiments in a laboratory. 2.Acrhimedes ____ in his bath. 3.Isaac Newton's experiments proved his ____ of gravity. 4.Before a pharmaceutical company can sell new drugs they have to ____ to make sure they are safe. 5.Scientists have to ____ into the possible ____ of new drugs. 6.People can volunteer to be ____ in ____. 7.In 1996, scientists were able for the first time to ____ sheep,which they named Dolly.

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