The Harry Potter series __________________ by J. K. Rowling., is written, was written, written, wrote, The most famous portrait in the world, Mona Lisa, ________________ ., was painted, is painted, were painted, has been painted, X-rays __________________ in 1895 by Wilhelm Conrad Roentgen, who was a German Professor., discovered, are discovered, is discovered, were discovered, Scissors ___________________ for cutting thin materials, such as paper and metal foil., used, are used, use, is used, The movie Avatar _______________ by James Cameron., is directed, directed, is being directed, was directed, Wooden toothpickes ______________ from birch wood., are cut, were cut, have been cut, will be cut, When ___________ the Great Wall of China ____________?, is / build, was / built, were / built, built / were, Cars _______________ in factories., are produced, were produced, is being produced, produced, Olives _______________ in Mediterranean countries., are grown, is grown, has been grown, was grown, Brilliant ideas ________ generally __________., were / copied, have been / copied, are / copied, is / copied, The light bulb ____________________ by Thomas Edison., was not invented, has not been invented, were invented, were not invented, How often __________ hotel carpets __________?, is / cleaned, was/ cleaned, will be / cleaned, are / cleaned, Google ____________ officially ____________ in 1998., has been launched, was launched, is launched, were launched

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