问题补充：
Peter the papers he was marking and reached for his cigarettes and matches.
A. set out
B. set off
C. set in
D. set aside
答案：
A. set out
B. set off
C. set in
(答案→)D. set aside
解析：短语辨析。A.出发；开始 B.出发；引起 C. 开始；到来 D.留出；不顾。句意：彼得停下手中正在批改的试卷,伸手去拿香烟和火柴。结合语境可知选D为最佳答案。
