Question

complete the sentence.
did you see ___ ducks in the pond?
some then put

Explanation:

To complete the sentence "Did you see ____ ducks in the pond?", we analyze the options: "then" is an adverb (doesn't fit as a determiner for "ducks"), "put" is a verb (doesn't make sense here), and "some" is a determiner used to refer to an unspecified number of things, which fits to ask about seeing an unspecified number of ducks.

Answer:

some