Choose one sentence that has the same meaning as the root one.
I had to go to the dentist because I had a bad toothache.
I had a bad toothache so I had to go to the dentist. I had to go to the dentist so I had a bad toothache. I had a bad toothache because I went to the dentist. I had a bad toothache why I had to go to the dentist.
