Question

is this sentence in active voice or passive voice?
in 1949, the u.s. food and drug administration approved the first drug for the treatment of cancer: the chemical compound hn-2.
active voice passive voice

Explanation:

To determine voice, check the subject - verb relationship. In the sentence, the subject "the U.S. Food and Drug Administration" performs the action "approved" on the object "the first drug...". Active voice has the subject doing the action (subject - verb - object structure), while passive voice has the object as the subject with a form of "be" + past participle. Here, the structure is subject (doer) - verb - object, so it's active.

Answer:

active voice