题目

语法填空     Smokejumpers are a special type of firefighter. They jump from planes into areas that are difficult to reach by car or on foot. When they arrive there, they first examine the land and decide to fight the fire. Their main goal is to stop a fire from (spread). They will use basic equipment to clear land of plants and other dry materials. The work is dangerous, they love being able to jump out of planes, fight fires, and live in the forest. As 38-year-old Alexi Tishin, who (work) as a smokejumper for 15 years, says, “This is the best job for tough guys.” 答案：【1】how【2】spreading【3】but【4】has worked

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