Read the text and put a, an, the or

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
kings crown was мейд 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, Ive 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.