Pick the word that best completes the following sentence. Der Professor ______ ein Chemiebuch.

The subject, “Der Professor,” is third-person singular. The verb “lesen” (to read) changes to “liest” with a third-person singular subject, so the sentence means “The professor reads a chemistry book.” “Schreiben” and “beschreiben” are infinitives, and “verkaufst” is the form used with “du.”

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