一、单词拼写(根据汉语或首字母提示写出单词的完全形式)
1.__________(某，某一)big oil companies attempted to cash in on the energy crisis.
【答案】Certain/Some
【解析】某大石油公司企图从能源危机中捞到好处
2.Life is full of __________(挑战). School is thought as the most __________(挑战的)obstacle in the lives of youth today.
【答案】challenges, challenging
【句意】生活充满了挑战。学校被认为是年轻人生活中最有挑战的障碍。
3.There is no doubt that climate all over the world has been __________(变化)greatly in recent years.
【答案】changing
【句意】毫无疑问，最近几年全球气候一直在剧烈变化。
