—I’m sorry to keep you waiting. —Oh, not at all. I _____ here only a few minutes.
Barack Obama has taken personal blame ________ the security failures which led ________ the attempt to blow up a plane on Christmas Day.
―Look! What a mistake! Why?―Sorry, I _________ on it.
My father didn’t have to say anything. I knew he was upset from his ________.
Cao Cao’s tomb is reported ________ in China, which attracts nationwide attention.
The chairman will be pleased at ________ scene that everything is in ________ place.