1.The sailors are asked to take their positions by their (机长).
答案:captain
2.The black clouds give a (警告) of the coming storm.
答案:warning
3.When do you guess the (飞机) will take off?
答案:airplane
4.He raised his arm as a (信号) for us to stop.
答案:signal
5.The earthquake has killed more than 600 people and caused (广泛的) damage in the country of South America.
答案:widespread
