根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Peter: Oh, it’s nine o’clock.      1_____

Monica:   2____ We are on holiday.

Peter: I have to meet Mary at the airport.

Monica:  3____

Peter: At about ten o’clock.

Monica: Just stay a little longer and have another cup of tea. It’s fresh and wonderful.

Peter: I am sorry I can’t. Thank you just the same. I would be late if I have it.

Monica: 4___

Peter: I have enjoyed the meal very much. It was delicious.

Monica: Thank you.  5___

A．What a pity that you have to leave so soon.

B．Why so soon?

C．I’m so happy.

D．What time is she arriving?E. I must be off now.

F. I’m so glad you like it.

G. How I wish you could stay a little longer.

使4.6gA物质在10g氧气中充分燃烧，反应后生成8.8gCO₂和5.4gH₂O，则A的组成中[ ]

A. 只有碳、氢两种元素          

B. 一定含有氧元素

C. A物质中碳、氢、氧的原子个数比未2:6:1

D. 氢元素的质量分数为25％