请根据句意及英文释义选择或写出单词。
1. — Mom, I'd like some hamburgers. I think they are very _________ (nice, good).
— OK, we'll have them for lunch.
2. — Please come in and have a _________ (seat, sit).
— Thank you.
3. — Dad, would you like to _________ (get, takes) a new bike for me?
— Sure. What color would you like?
4. These are your oranges. Those are _________ (my oranges).
5. — What time do you often get up in the morning?
— At a _________ (fifteen minutes) past six.
和
的物质的量浓度（假定在混合液中加入氢氧化钡粉末后体积未改变）。