Whenever you are to walk on the ice that it is solid and safe enough.A. examineB. checkC.

问题补充：

Whenever you are to walk on the ice, that it is solid and safe enough.

A. examine

B. check

C. try

D. make

答案：

A. examine

(答案→)B. check

C. try

D. make

解析：根据句意,所缺词的词义应该是“检查”,而examine不跟句子,所以B正确。