---When did Hong Kong return to our motherland?

---______ July 1st, 1997.

1. A.
   On
2. B.
   In
3. C.
   At
4. D.
   For

We will celebrate the 90^th birthday of the Chinese Communist Party _____ July 1st, 2011.

A. on         B. at       C. in       D. during

There will be ________ visitors in Hong Kong on July 1,1997.

1. A.
   thousands
2. B.
   thousand
3. C.
   thousands of
4. D.
   thousand of