Doing more sports is good ________ our health.

1. A.
   for
2. B.
   on
3. C.
   about
4. D.
   of

Doing more sports is good ________ our health.

[　　]

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

---Doing sports ___ good for our health.

--- Yes, so I do morning _____ every day.

A．is, exercise                            B．is, exercises

C．are, exercise                           D．are, exercises