James would only speak to the head of department alone. ON → James ........................................... to the head of department alone.
insisted on speaking
At the time, scientists did not realise how important their findings were. FAILED → At the time, scientists ............................................ of their findings.
failed to realise the importance / significance
People believe that Leonardo da Vinci foresaw the invention of aircraft. BELIEVED → The invention of aircraft .............................................................. foreseen by Leonardo da Vinci.
is believed to have been
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