The most important thing is to keep when you get into difficulties. A. quiet B. calmC. st

问题补充：

The most important thing is to keep when you get into difficulties.

A. quiet

B. calm

C. still

D. silent

答案：

A. quiet

(答案→)B. calm

C. still

D. silent

解析：考查形容词：A. quiet安静的，B. calm冷静的，C. still不动的，D. silent 沉默的，句意：最重要的是你陷入困难的时候要保持冷静。选B。