<span>A. Mr. White will make other serious mistakes by acting without thinking of the consequences.</span>
<span>c. tradition is the only thing that prevents people from becoming uncivilized</span>
In the first sentence, the "he" is a nominative as it is a subject.
In the second sentence it is an object as the form "me" is actually "I", but "i" is a nominative form and "me" is an objective form.
In the third sentence "Us" is also used in objective form as "us" is an object of an action by "my sister".
There was a loud knock on the door, my parents were home. I didn’t know why they were home but they came. I opened the door in shock and asked them why they were home so early. They said we can home early because we have a surprise. I said really, a surprise? They said yes we are going to a different state for a few weeks. I was so ready and excited to go. I couldn’t wait, when are we leaving I asked, they said tomorrow. Ok I’ll go pack now then.
This helped him by being able to interact with his family.
I know this might be short and boring, it should work though, let me know if you have any questions and make sure to check for spelling errors and punctuation errors. Hope this is helpful, have a great day.