Read the Laszlo Biro story and choose the correct form of the verbs.
People wrote were writing with quills, pens and pencils long before Laszlo Biro invented /
was inventing his biro in 1938. While he worked /was working as a journalist in Hungary,
he noticed /was noticing that the ink used in newspaper printing dried quickly. But this
ink would not flow into the tip of a fountain pen. In 1938, he developed /was developing
a new tip using a ball that was free to turn in its socket. He died /was dying in Buenos
Aires in 1985.​
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