句型转换。

1. This is a ruler. (改为一般疑问句)

    ______a ruler?

2. That's a box. (改为一般疑问句并作肯定回答) 

    —______a box?

    —______.

3. Is this his pencil sharpener? (改为陈述句)

    ______ pencil sharpner.

4. Are these his Chinese books? (作否定回答)

    ______________________________.

5. That is an eraser in English. (就画线部分提问)

    ______ in English?

6. do, How, spell, you, it (连词成句)

    ______________________________.

There _________ always a lot of snow in this place every winter.

A．has

B．is

C．have

D．are