Few of them hurt themselves in the accident , ______?

—     do you surf the Internet?—Once a week.

—Judy’s never been late for school, ________ she?—________. She is always the first to get to school every morning.

I won’t believe that the five-year-old boy can read magazines ____ I test him myself. 

---He seldom revised for exams, ___________ he? ---___________. He always got low marks in exams.