根据汉语提示、首字母或用所给词的正确形式完成句子。

1. I want to buy a teddy bear. But I don't have ________(足够的) money.

2. In our English Club I often ________(练习、操练)English with my friends.

3. Does this sentence _________ (听起来) right?

4. This pair of trousers is beatiful. I think it m_________ your sweater well.

5. Morning exercises are good for us. They help us get r___________ for the day.

6. Kitty is a t__________ student in our class and she has a healthy lifestyle.

7. It is 4.30. Millie __________ (write) a letter to her friend Danniel.

8. ________ (mango) and apples are my favourite fruit.

化学就在我们身边，它与我们的生产、生活息息相关。从①石灰石、②金刚石、③一氧化碳④干冰四种物质中，选择与下列用途相对应的物质，填写在空白处。

⑴用作建筑材料的是       （填序号，下同）；

⑵用作人工降雨的是　　　　　；

⑶镶在玻璃刀头上用来裁玻璃的是       ；

⑷具有毒性的气体是