situation什么情况下用复数?

situation什么情况下用复数?
Kite works on the 70th floor of an apartent tower in New York.She had just left her office and was trapped in an elevator on the 65th floor.At first she was worried.She called Sam and Sam remembered that his friend Joe worked high in that building.Joe could take care of the s(ituations).
这里situations为什么要有复数?这个词什么情况下用复数?
P.S.不要把字典粘上来:)
还有其他回答吗?因为答案里明确表明不要漏了s,我觉得单数没有什么不对