1.Marie Curie and Pierre Curie ______________ radium and polonium., discovered, 2. Thomas Edison ___________ the light bulb in 1880., invented, 3. Sarah Gilbert is the creator of a vaccine. She ___________ it in 2020, created, 4. Scientists have carried out many ___________ to find a cure for cancer., experiments, 5. Scan your finger on this _____________ to check attendance, please., fingerprint scanner.

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