用词、短语或句子补全对话。
Mei: Mom, my American friend, Mary, invited me to dinner this evening.
Mother: Really?1.________?
Mei: Seven. I'm afraid I have to go now.
Mother: 2. ________. It's only five thirty. You still have one and a half hours
left. Besides, her home 3. ________ from here.
Mei: Maybe I should get there early, or she will be worried.
Mother: You know, in the USA, people go to dinner neither too late nor too early.
You should 4,________ there at about seven.
Mei: I see. What do you think I should bring with me?
Mother: You don't need to take anything. If you like, you can 5________.
Mei: Do you think only flowers are enough?
Mother: Of course. That's pretty good.
2SO３，测得SO３浓度与反应温度关系如图。下列说法正确的是 ( )