15.(A). I don’t think you will have any difficulty.

　　(B). I’m not the course of your problems.

　　(C). I’m sorry to have inconvenienced you.

　　(D). I came because I heard you were in trouble.

　　16. (A). They were eager to go on the tour.

　　(B). They viewed an exhibit on tool-making.

　　(C). They went to the museum even though they were hungry.

　　(D). They developed an appetite during the tour.

　　答案：

　　C D

　　音频文本:

　　15. I didn’t mean to cause you so much trouble.

　　16. The children had a long tour of the museum and became very hungry.