选词填空。

A. what time  B. What day  C. How many  D. When  E. what

1. —__________ books do you have?

    —I have one.

2. — ________ is it?

    —It's Monday, July first.

3. —______ is National Day?

    —October first.

4. —______ is it?

    —It's six o'clock.

5. —______is this?

    —It's the sun.