The lead singer was ill and couldn’t sing that night and her didn’t perform well which

问题补充：

The lead singer was ill and couldn’t sing that night, and her didn’t perform well, which made the audience disappointed.

A. attitude

B. substitute

C. institute

D. altitude

答案：

A. attitude

(答案→)B. substitute

C. institute

D. altitude

解析：句意：那天晚上领衔歌手生病无法演出，她的替补表现得也不好，这让观众很失望。substitute意为“替换者；替补”，符合句意。attitude意为“态度”，institute意为“学会，协会；学院”，altitude意为“高度；海拔”。