Select the most appropriate option to fill in blank number 2.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. employ.
Context: The sentence is in present simple tense describing a general fact. 'Such forms of medicine ... natural products' means they make use of them.
Analysis of the given options:
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employ – Correct; means “to make use of” in present form for plural subject
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employing – Would require a continuous form; not suitable here
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employs – Incorrect because the subject is plural ('forms of medicine')
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employed – Past tense, not suitable for the general fact stated
Correct word: employ
Reason: Plural subject “forms of medicine” takes the base verb without ‘s’ in present simple tense.
Hence, the chosen option is correct.