Home Page Textbooks Glencoe Language Arts: Grammar and Language Workbook, Grade 9 Section 76: Commas and Compound Sentences

Glencoe Language Arts: Grammar and Language Workbook, Grade 9

1st Edition

McGraw-Hill

ISBN: 9780028182940

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Section 76: Commas and Compound Sentences

Exercise 1

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Many important discoveries in the field of science are the result of work done by women, and the achievements of Dorothy Crowfoot Hodgkin are no exception.

Exercise 2

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Dorothy Crowfoot was born in Egypt, and moved to England when she was a child.

Exercise 3

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Exercise 4

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Her father was interested in archaeology, and her mother shared his interest by collecting unusual plants and studying ancient methods of weaving cloth.

Exercise 5

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While at school in England, Dorothy first learned about the science of chemistry, and her interest was to lead her to a scientific career.

Exercise 6

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Exercise 7

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Certain natural substances are actually made up of tiny crystals, but mane people do not know that even aspirin is crystalline.

Exercise 8

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Substances made of crystals can look quite different, yet all crystals share important characteristics.

Exercise 9

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Cross out comma

Exercise 10

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Patterns in crystals repeat themselves over and over, and crystals with flawless repetition are said to be perfect.

Exercise 11

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Dorothy finished high school, and she decided to attend Oxford University.

Exercise 12

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Dorothy studied at Oxford for four years, but then she received an offer to be an assistant to a famous chemist at the University of Cambridge.

Exercise 13

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She became familiar with a research technique called X-ray diffraction, and this method became one of the foundations of her career as a scientist.

Exercise 14

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Later, she returned to Oxford to teach and do research.

Exercise 15

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She received a laboratory space in which to work and continued her studies of crystals, but another element soon appeared in her life.

Exercise 16

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She met a young man named Thomas Hodgkin, and the couple was married a short time later.

Exercise 17

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World War II began shortly after her marriage, but Dorothy’s work was not interrupted.

Exercise 18

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The war led to Dorothy’s first major scientific success, and her discovery was to have far-reaching consequences.

Exercise 19

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Remove comma

Exercise 20

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Exercise 21

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Doctors knew that penicillin could cure diseases caused by bacteria, yet it was available in such small quantities that it could not be used in widespread applications.

Exercise 22

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It was a medical dream to learn to “grow” penicillin artificially in a laboratory, for then it could be manufactured in large quantities.

Exercise 23

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Dorothy started to work on this problem, but it proved to be very difficult to crystallize the penicillin molecules.

Exercise 24

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Dorothy and her assistants analyzed the structure of penicillin using the X-ray diffraction technique, and the discoveries they made changed the history of medicine.

Exercise 25

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Penicillin and similar drugs can now be manufactured in large quantities, but this breakthrough could not have been achieved without the work of Dorothy Crowfoot Hodgkin’s team of scientists.

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Section 76: Commas and Compound Sentences

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