---How many people will come to Beijing next year?

           ---It's hard to say.               people ,I think.

A. Million of           B . Millions of     C. Three millions   D. Three millions of

---How many people will come to Beijing next year?

---It’s hard to say.              people ,I think.

1. A.
   Million of
2. B.
   Millions of
3. C.
   Three millions
4. D.
   Three millions of