句型转换。

1. Call him back! (改写为否定句)                

    ________ ________ him back!

2. There will be more roads in our town.(改写为一般疑问句)

    _____   _ there ____    __ more roads in your town?

3. They must not sweep the floors today.(对划线部分提问)    

    _______ ________ they sweep the floors?

4. Going to bed early and getting up early will keep you active in the daytime.(改为同义句)

    Going to bed early and getting up early will keep you active ________ the ________.

5. 我们的英语老师擅长讲笑话.(完成译句)

    Our English teacher    ___ well ____   _ telling jokes.

下列每组物质发生状态变化所克服的粒子间的相互作用力属于同种类型的是[ ]

A．食盐和蔗糖熔化

B．钠和硫熔化

C．碘和干冰升华

D．晶体硅和氧化钠熔化