Exercise 1
Draw a line under the correct personal pronoun in parentheses.
The history of (our, ours) sciences is very old.
1. The history of science is the story of men and women and (their, they) discoveries.
2. Early people who wanted (them, their) lives to go well paid tribute to the forces of nature.
3. (They, Them) made up stories about these forces to explain the world and (it’s, its) wonders.
4. Today (we, us) call these stories myths and enjoy reading (they, them).
5. Eventually, in Greece, some people started observing the way (they, their) world worked.
6. (They, Their) observations led to discoveries about the physical laws of (our, ours) universe.
7. Democritus said all matter
was made of basic particles, or atoms;
the founder of the atomic
theory was (he, him).
8. Pythagoras theorized that Earth was round; this contradicted
what people thought and it
confused (they, them).
9. Archimedes discovered the laws of the lever and the pulley; (they, them) make (you, your) life
much easier today.
10. Eratosthenes did calculations with distances on Earth to calculate (it’s, its) circumference.
11. The Greek physician Galen
developed medical theories; (he, him) encouraged the knowledge
of (our, ours) anatomy.
12. During
the Dark Ages, Arab philosophers kept science alive, and we owe to (they, them) much
of our astronomical knowledge.
13. When Nicolaus Copernicus asserted
that all planets orbit the sun, the Earth-centered scientific
philosophy of (our, ours) ancestors ended.
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