Answer: The sentences that use definition 3 of the word "baste" are "The maids were ordered to baste the quilt to keep the layers in place" and "Before stitching the gown, Marie learned to baste the seams of a dress for a fitting".
Step-by-step explanation: In sentences 2 and 4 ("The maids were ordered to baste the quilt to keep the layers in place" and "Before stitching the gown, Marie learned to baste the seams of a dress for a fitting") the word "baste" means to sew with long stitches in order to hold something together. In the case of sentence 2, what is meant to hold together is a quilt, while in sentence 4, what are held in place are the seams of a dress. In that way, both sentences use definition 3 of the word "baste". In contrast, sentence 1 uses definition 2, and sentences 3 and 5 use definition 1.