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Read a school story about Albert Einstein, a famous scientist. Put the words in brackets in the Past Simple Tense or the Past Continuous Tense.
One day Albert Einstein ( was writing, were writing, wrote ) a formula on the blackboard, when he ( heard, hears, was hearing ) a strange sound. The next moment a dark shadow ( appeared, appears, was appearing ) and ( started, start, was starting ) to erase the formula. While the shadow ( was jumping, were jumping, jumped ) up and down the board, Einstein ( was looking, looked, look ) at it in surprise. Suddenly it ( disappeared, was disappearing, disappear ). The scientist ( turned, was turning, were turning ) to the students and ( winked, was winking, winks ) at them: “Eureka! There ( was, is, was being ) a mistake in the formula. Now it’s correct!”
