【C9】A．dangerB．threatC．riskD．problem

This sign warns（)ahead.A.people the dangerB.people of the dangerC.people about the dange

The policemen acted quickly because lives were （at stake).A．in dangerB．in difficultyC．in d

A．rushB．turnC．riskD．fall

【C2】A．botherB．enjoyC．riskD．tolerate

【C9】A．effortB．tryC．riskD．attempt

【C7】A．evidenceB．threatC．riskD．hint