You might have missed some key concepts in the last lesson. I understand that all the numbers can get confusing, but it is important that you try to understand all of the information. These lessons are very condensed, so every word counts.
Attached are the three basic voice leading situations I want you to master. There are many more ways to handle cadences, but for now we are sticking to these formulas that end with the tonic in the top voice.
[Certainly the mediant or the dominant notes can be in the upper voice of an I chord too. However, classical theorists classify cadences with the tonic in the top voice as the most "final," the most conclusive. Renaissance composers, however, would not hesitate to end with the mediant in the top voice, especially if the I chord were major. And some composers would end with the dominant in the top voice of I for special effect, like the soprano dominant pedal point that ends Frescobaldi's Cento Partite.]
Now to the errors: (I am numbering each repeat section)
1. Good.
2. I wanted to see if you knew how to lead the supertonic downwards in the upper voice. Your progression is very good but I am teaching something else here, and I said so in the instructions.
3. Good.
4. Good. [You should, however, learn to occasionally move the supertonic downwards even if it is in an inner voice.]
5. Wrong like #2.
6. Great, if the b natural is a typo. Otherwise, you have discovered secondary dominants! [We'll get to them eventually.]
7. Listen to this one a few times and tell me why it is wrong.
8. Great.
9. Great.
10. Great.
11. Not good. You started out with a doubled third, and it messed up the following chords. And you finally figured out how to move the supertonic note downwards, but with parallel octaves and a thirdless V

.
I would like for you to correct all these errors. Feel free to discuss the last lesson with me in closer detail, since it is a lot to swallow. Don't be discouraged, you are progressing very quickly; I expect more than a few errors along the way.
Also, about the error in repeat 11:
I would like for you to reread my last lesson and explain why omitting the third of a chord is particularly dangerous with the V chord.