单项选择题
When you go to the doctor he asks you to describe your（）so that he can make a diagnosis (诊断).
A.indications B.signs C.symbols D.symptoms
单项选择题 He ran so fast that he was out of（）
单项选择题 Be careful with those fireworks; they are（）to go off unexpectedly.
单项选择题 Most people who travel in the course of their work are given travelling（）
