Harmonization exercise from my Organ Mass

Today I have finished creating a Gradual for the Organ Mass for 30th Sunday. In a couple of weeks I will be performing the entire cycle of 11 pieces for the 19th century organ re-dedication recital in the church from the 18th century in Mosedis (Northern Lithuania). Incidentally, this place is famous for its museum of stones.

This Gradual is based on the opening of the modified Gregorian chant melody "Unam petii a Domino". I thought I would share with you the beginning of this piece because it works perfectly as a harmonization exercise.

So in the above picture you can see this melody of 8 measures. Try to harmonize it with 4 part harmony observing the rules of voice leading and avoiding parallel fifths, octaves, and movement of all parts in the same direction.

I have harmonized this melody using root position, first and second inversion chords as well as the D7 chord at the end. Below each chord I have written the chord symbols so that you will see exactly what kind of chord I used for each instance.

See if you can create a different harmonization than I did (there are dozens of ways to do this).

Here is the PDF file for printing and the MIDI file for listening.