For this case we have the following sentence:
Compré la _________ en la taquillera.
The translation of the sentence in English is given by:
I bought the _________ in the box office.
We must fill in the blank space with the correct word.
<em>We know that in the box office we can find tickets for a certain event.
</em>
By completing the sentence in English we have:
I bought the <em>ticket</em> in the box office.
The translation in Spanish is given by:
Compré la <em>entrada</em> en la taquillera.
Answer:
Compré la entrada en la taquillera.