e Another problem is that of farne.Insome cases, scientists have their work done for them
by others. The astronomer William Herschel made many important discoveries, but he was
helped a lot by his sister Caroline. Unfortunately, he didn't mention this to other scientists.
(told people) ..
f Other scientists get into political trouble. The French chemist Lavoisier discovered how
oxygen is used in burning, and in rusting. However, the French revolutionary authorities
arrested him because he was also a tax collector, and in 1794 he was executed.
(execute) ..S Complete the text with could, couldn't, had to, didn't have to, didn't need to, needn't have, should
haveorshouldn't haveand the verbs in brackets. Not ali are used in the text.History contains a lot of stories about people who a (be).SYto.uldjlav~h~~f'\ a little bit more carefuL
In 1576 the explorer Sir Martin Frobisher sailed to the north of Canada trying to find a way to Asia.
Unfortunately, he b (find) it, but during the voyage, his men landed on Baffin Island as
they c (look for) ... .HH food and shelter. Here he discovered some rocks which he thought
contained gold. When he returned to England he showed the piece of rock to people who agreed that it was
gold, and Frobisher returned to the island with a larger ship. lt was a difficuIt journey, as the ship d (avoid)
....................................................huge icebergs. On the island there were polar bears whiche(kill) .....
a man quite easily And Frobisher was worried that someone else would get to the gol d first. Perhaps he
f(tell) .... so many people about his
discovery, he thought. But he g (worry) ..
about his secret. He found the place again, and his men
h (work)H in the freezing weather to dig
for the gold. They returned to England again, and this time
hei(stop) ... his discovery from
becoming generally knoWll. More and more people wanted
to go to Baffin lsland, and the next year the ships came
back with hundreds of tonnes of gold. Unfortunately,
this is where things went wrong. When Frobisher tried
to sell the gold, he discovered that perhaps hej(show)
......... it to more people in the first place.
The people he had showed it to had been wrong. They
k (tell) ...... .. the difference between gold
and iron pyrite, a compound of iron and sulphur.
Everyone laughed at Sir Martin and his men, and he
I(admit).. ... that he had made a mistake.1 Think about your first schoo!. Make a list of thing you had to do, or didn't have to do.2 Make a list of things that famous people in the past should or shouldn't have done.
Need more practice? Goto theReviewon page 192.+o'Vl -
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