The correct pair of words to complete the conversation is 'musst, wählen'.
The correct pair of words to complete the conversation is:
In this case, 'musst' is the correct conjugation of the verb 'müssen' (must) for the subject 'ich' (I) and 'wählen' is the infinitive form of the verb 'wählen (to choose), which completes the sentence properly.
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