Correcting Run-Ons and Fragments

What is the following sentence? Open the door very carefully.

What are the following sentences? I went in, I bought the gift. I drove straight home.

How could you fix this fragment? Since we had no money and no transportation.

What is the following sentence? Because I have no time.

How could you fix this fragment? So she went for a walk in the park.

How could you fix this fragment? Reading the book with the raised lettering on the cover.

How could you fix this run-on? I studied for my chemistry exam for six hours, I still did not pass it.

How could you fix this fragment? America, the greatest country in the world.

How could you fix this fragment? But she didn't like to eat hamburgers.

How could you fix this run-on sentence? He is not an exceptional student, he is only average.

How could you fix this run-on? He swims she walks

How could you fix this run-on? The first evening of rehearsal was a disaster no one knew his lines.

What is the following sentence? Having finished her dinner, Joy sat down to an evening of television.

How could you fix this fragment? The man that I saw yesterday.

What is the following sentence? To know everything is quite impossible.

How could you fix the following sentence? Then we went to the grocery store.