A seven letter word containing thousands of letters - a mailbox.
The word mailbox has 7 letters, and it contains thousands of letters - just not the letters from the alphabet, but rather a form of a paper message.
He is the man responsible for the plague. He stricken Thebes. Hope this answers your question.
Answer:
You could get two 'complete' sentences without the connection.
I guess I like your teacher for the Sonic reference.
I have no idea that ones hard
For number 2. It’s C I believe