Which word best completes the sentence.
_______ is a sale of parrots at the pet store.

The correct answer is: There

There is a scale of parrots at the pet store. 'There' is the correct option. Because the speaker is speaking about the store which is not near and somewhere else. So, we should use the determiner 'there' to denote the store. Moreoever, the speaker particularly speaks about the parrots and for that also, 'there' can be used.