The telephone ______________________________ (invent) by Alexander Graham Bell in 1876., was invent, was invented, Many people ______________________________ (use) smartphones to communicate with their friends every day., were using, use, The first successful heart transplant ______________________________ (perform) by Dr. Christiaan Barnard in 1967., was perfomed, were performed, My sister ______________________________ (buy) a new laptop for her university classes last month., buyed, bought, Thousands of electronic devices ______________________________ (produce) in factories around the world every day., are produced, is produced, Marie Curie ______________________________ (discover) the elements polonium and radium in 1898., discovered, was discover, Solar energy ______________________________ (use) to generate electricity in many countries around the world., was used, is used, The students ______________________________ (create) an interesting science project for the school exhibition last week., create, created, Many scientific experiments ______________________________ (conduct) in laboratories every year., are conducted, conduct, My father ______________________________ (repair) his old computer yesterday afternoon., repair, repaired

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