Read the text and put a, an, the or – in each gap.
a) Archimedes in his bath
Do you remember the story of 1____Greek scientist Archimedes? He
was trying to solve 2____problem in 3_____physics – how to show if the
king’s crown was made of 4_____ gold or not.
He thought and thought, but he could not find the answer. So he stopped
worrying and had 5___ bath instead. Suddenly, 6___ answer came to his
mind. He was so excited that he jumped out of his bath, naked, and ran
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down the street shouting, ‘I’ve found it!’ Actually, what he said in 7____
Ancient Greek was ‘Eureka!’ We still use this word in 8____English when
we suddenly find 9___ answer to a problem.
b) Einstein on the tram
Albert Einstein had 1___ first idea about 2____ Theory of 3____ Relativity
when he was traveling home from 4____ work on the tram in Geneva.
c) The scientist who saw the solution on a bus
The chemist ‘Kekule’ is famous for having discovered a lot about how
1____ atoms and 2____ molecules are arranged.
3____ first discovery happened when he was riding on a bus, one evening
in about 1855, thinking about other things. Suddenly, he saw 4___ atoms
dancing before his eyes. Then one atom joined another one to make
5____ chain. When he got off the bus he understood how 6___ atoms join
together to make molecules.
3. Fill in the gaps with the, a, or –. Underline the correct word.
__ Scientists do __ lot of __ research in order to find __ cues for various
diseases.
__ lot of money is/are spent on ___ equipment every year, but ___ information
collected is/are invaluable.

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