Choose the correct option to fill in the blank with the appropriate Modal.

Mary expects that her son_____ return.

A. need
B. may
C. used to
D. dare
E. ought to

B only

The correct option to fill in the blank with the appropriate modal is: B only

The corrected sentence is: "Mary expects that her son may return."

Explanation:

In this context, the modal "may" is appropriate to indicate a possibility or likelihood that Mary's son will return.