Doing sports is good for your health, _______ ?

1. A.
   is it
2. B.
   are they
3. C.
   isn’t it
4. D.
   aren’t they

Doing homework      most of my time on Saturdays.

Doing sports can help improve our health
A. make …worse          B. make …better      C.   make…the same

---Doing sports ___ good for our health.
--- Yes, so I do morning _____ every day.