[Follow-up activity:] Complete the ii by adding the two remaining voices.
[Answer:
] Seventh chords typically resolve by falling-fifth root motion. In other words, a seventh chord will normatively resolve to the sonority whose root is a fifth below (or a fourth above) its own root. In Example 6, the ii chord (whose root is D) resolves to V (whose root, A, is a fifth below). Note that the falling-fifth root motion is not affected by the fact that the ii chord appears in inversion.