能源是人类生存和发展的基础，能源成为人们日益关注的问题．

（1）化石燃料包括煤、____ 、天然气等，是重要的能源；目前正在利用和开发的新能源有核能、生物质能、____ （填一种）等．

（2）发射卫星的火箭可使用液氢作燃料，液氢在液氧中燃烧的化学方程式为____ ，该反应属于基本反应类型中的____ 反应．

（3）物质R是一种可再生绿色能源，其燃烧的化学方程式为R+3O₂2CO₂+3H₂O，则R的化学式为____ ．

A: Excuse me. Can I take photos here?

B: No, you can't.____ It says "No photos"

A: Sorry. But how can I remember these beautiful things?

B: You can buy postcards of them in the museum shops.

A: Thank you.____

B: You'd be better not.

A: Oh, dear!____

B: There is a smoking room on the first floor. You call smoke there.

A: Sounds great. But I'm new here.____

B: Sure. This way, please.____Don't smoke too much.

A: Thanks for your advice. I'll think about it.

B: You're welcome.

qún  zhòng  chà  bù  duō  bǎ  sǎng  zi  dōu  hǎn  yǎ  le，bǎ  shǒu  zhǎng  dōu  pāi  má  le．

____，____