Question

Scientists have (1)______ a gel that helps brains

recover from traumatic injuries. It has the potential to (2)______ head injuries sustained in combat, car accidents, falls, or gunshot wounds. (3)_______ by Dr. Ning Zhang at Clemson University in South Carolina, the gel is (4)_______ in liquid form at the site of injury and stimulates the growth of stem cells there. In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

A 1. manufactured, 2. heal, 3. Initiated, 4. implanted

B 1. developed, 2. treat, 3. Developed, 4. injected

C 1. produced, 2. medicate, 3. Established, 4. interjected

D 1. constructed, 2. assist, 3. Devised, 4. inserted

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Scientists have (1)______ a gel that helps brains

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