—I don’t know if Dr. White _______ to the party next week?

—I think he will come if he ________ free.

---I don’t know if Dr. White _______ to the party next week?
---I think he will come if he ________ free

1. A.
   comes; will be
2. B.
   will come; will be
3. C.
   comes; is
4. D.
   will come; is

—I don’t know if Dr. White _______ to the party next week?

—I think he will come if he ________ free.

A．comes; will be         B．will come; will be         C．comes; is         D．will come; is

—I don’t know if Dr. White _______ to the party next week?
—I think he will come if he ________ free.