单词拼写。

1. It's not very ______ (方便的) to pay by cash.

2. This Chinese square table is a very valuable piece of ______ (家具).

3. My uncle got ______ (订婚) to a beautiful girl last Sunday.

4. The house stood ______ (空的)for a while.

5. Faced with a new ______ (挑战), the scientists are working day and night.

6. His father was ______ (沉溺于) to drugs.

7. You will find the Bird's Nest ______ (设计) in an unusual way.

8. I love the writing ______ (风格) of this great writer.

9. We paid a vist to a beautiful park, ______ (座落于) on a river bank.

10. The company's head office is in the US, but it has ______ (分支机构) all over the world.

“C类火灾”指气体火灾，如煤气、天然气、甲烷、乙烷、丙烷、石蜡、氢气火灾等。