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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the option that best fits each of the numbered...

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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 9 to 14.

The Development of The Electrocardiogram

The electrocardiogram, or ECG, is a medical device that records the electrical activity of the heart. It was first invented in the early 1900s by a Dutch physiologist (9) ______ Willem Einthoven. Before his invention, doctors had struggled to understand heart irregularities because there were no (10) ______ tools for measuring heart signals.

Einthoven’s early device was called the string galvanometer. It was large, required several operators, and (11) ______ an entire room. Einthoven had been studying the electrical patterns of the heart for several years when he began developing the machine. He noticed that each heartbeat produced a small electrical signal, and he believed that these signals could reveal (12) ______ information about heart conditions.

By 1905, Einthoven had succeeded in recording the first human ECG, (13) ______ marked a major breakthrough in cardiology. In the following decades, engineers and medical experts improved the technology, making the machines smaller, faster, and more accurate. Today, ECGs are used in hospitals and clinics around the world to diagnose a wide (14) ______ of heart problems, from arrhythmias to heart attacks.

(Adapted from ResearchGate)

Question 9:  A. named B. be named C. naming D. is naming

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