Question paraphrase: In exercise 59, fill in the text with could, couldn’t, had to, didn’t have to, didn’t need

Question paraphrase: In exercise 59, fill in the text with could, couldn’t, had to, didn’t have to, didn’t need to, needn’t have, should have, or shouldn’t have, along with the verbs in parentheses. Not all verbs are used in the text. History contains numerous accounts of individuals who should have been more cautious. In 1576, the explorer Sir Martin Frobisher set sail to the north of Canada in an attempt to find a route to Asia. Regrettably, he found it. However, during the voyage, his crew landed on Baffin Island as they searched for food and shelter. Here, they discovered rocks that they believed contained gold. Upon returning to England, he displayed the rock to individuals who agreed it was gold, and Frobisher returned to the island with a larger ship. The journey was challenging as the ship avoided enormous icebergs. Polar bears on the island could easily kill a man, and Frobisher worried that others might reach the gold first. Perhaps he had shared his discovery with too many people. Nevertheless, he was concerned about keeping it a secret. He rediscovered the location, and his crew worked in freezing weather to dig for the gold. Upon their return to England, this time, he prevented his discovery from becoming widely known. As more and more people desired to go to Baffin Island, ships returned the following year with hundreds of tons of gold. Unfortunately, this is where things went awry. When Frobisher attempted to sell the gold, he realized he should have shown it to fewer people initially. Those he had shown it to had been mistaken; they couldn’t differentiate between gold and iron pyrite, an iron and sulfur compound. Everyone laughed at Sir Martin and his crew, and he admitted his error.