Question

1. fill in the blank:

a contraction uses an apostrophe to replace
word bank: titles, phrases, commas, periods, capitals, letters

Explanation:

In contractions (e.g., "don't" from "do not", "it's" from "it is"), an apostrophe replaces one or more letters that are omitted when two words are combined into a contraction. The other options (titles, phrases, commas, periods, capitals) do not fit the definition of what an apostrophe in a contraction replaces.

Answer:

letters