根据句意及首字母提示完成单词。

1. —How much are the bags?

     —They're fifteen d_________.

2. —Can I h________ you?

3. My shoes are small. I want to b_________ big ones.

4. We have c_________ in all colors.

5. C_________ and have a look at the bags.

6. My shirt is w_________, but your shirt is black.

为防治酸雨，可将造纸厂回收的碱白泥（主要成分是碳酸钙和氢氧化钠）掺进煤中进行“固硫”。在该过程中不可能发生的化学反应有

A．CaCO₃高温 CaO + CO₂ ↑

B．2NaOH + SO₂="===" Na₂SO₃ + H₂O

C．CaO + SO₂高温 CaSO₃

D．CaCO₃+ 2NaOH="===Ca(OH)" ₂ + Na₂CO₃