4. Many big cities in the world (正面临淡水资源 短缺) Key: are facing the shortage of freshwater resources 5. He said nothing, leaving me (对他的计划毫不知 情). Key: in the dark about his plan4. Many big cities in the world__________ ____________________(正面临淡水资源 短缺）. Key: are facing the shortage of freshwater resources 5. He said nothing, leaving me_______ _________________（对他的计划毫不知 情）. Key: in the dark about his plan