--I've got a ticket to the opening ceremony of the twenty-ninth Olympics. I'm leaving for London in a few days.--What a lucky guy! A. It's kind of you B. Enjoy yourself C. That's all right
Beijing, ______________ capital of China, has _________________ long history.
The teaching building has five floors. My classroom is ______________ the third floor.
—Open the window please, Mike. —____________? I didn’t hear what you said.
----Do you mind if I sit here? ----________. It’s for Mr Brown.
Never stand up ________ you are asked to.