问题补充：
He was a bit nervous. He his spare breath with a soft sound that was almost heard by the audience.
A. gave out
B. let out
C. picked out
D. blew out.
答案：
A. gave out
(答案→)B. let out
C. picked out
D. blew out.
解析：
试题分析:句意：他有点紧张。他发出的轻微喘息声几乎都被听众听到了。A发出（光，热等），分发，耗尽；B发出（声音），泄露秘密；C挑选，认出；D吹灭（火焰）。由句意可知答案选B。
