根据短文内容及首字母提示填单词

     We're having a (1)w__________ time in New Orleans. It's so great to be here during

Carnival time or Mardi Gras, as it's called in the brochure. New Orleans is always lively,

but it's so much more fun to go (2)s__________ here at the moment. We have eaten some

(3)d__________ food here very hot! We have enjoyed music played by a great band on the

famous Bourbon Street and have (4)d__________ lots of beer! We've even been on a boat

(5)t__________ on Mississippi and luckily I didn't (6)f__________ into the river! Then, sadly,

it's just one more night before we have to get on our (7)p__________. It has been such an

enjoyable time and it seems I've lived in a (8)d__________. I've taken many (9)p__________

and I want to (10)s__________ them to my classmates.

过去教材中实验室制氧气，常用氯酸钾与二氧化锰混合加热制取，从预热到收集满一瓶（250mL）氧气大约需8～10分钟，从反应后剩余的固体中回收二氧化锰比较困难，曾有同学去闻自己收集到的氧气，想找找吸氧的感觉，结果却闻到刺激性气味（少量氯酸钾发生副反应生成有毒的氯气）．现行教材已改用过氧化氢溶液和二氧化锰混合制取氧气，你认为这样做的优点都有哪些？

（1）______；（2）______；

（3）______；（4）______．