Angles 6 and 7 are vertical angles, not alternate interior.
The same applies to angles 4 and 1, and angles 5 and 8 as well.
Any time you have two lines cross to form an X shape, the angles that are opposite one another are considered vertical angles and are always congruent.
The values you have typed into the boxes are all correct. The other drop-down choices are correct as well. Nice work.
