填空题

Most volcanoes are quiet. They rest (S1) ______ for hundreds of years. No one pays much attention to them. Mount St. Helens was one of these volcanoes. Until 1980, it was a beautiful (S2) ______ area. Its last eruption had been 123 years ago. No one was worried about another one. Then, in March 1980, Mount St. Helens began to make noises. At first, there were tremors. Then, small eruptions (S3) ______. Some residents left immediately. Others felt there was no danger. But on the morning of May 18, 1980, the mountain (S4) ______ its top. With the power of twenty-five (S5) ______ bombs, Mount St. Helens exploded. Clouds of dust and ash rose more than twelve miles into the sky. Rocks and mud crashed down the (S6) ______ Unfortunately, many people were still living, camping, or working in the area. Over forty people lost their lives. Others were (S7) ______. Robert Baker was (S8) ______. He reported that the morning of May 18 was strange. No birds were singing. The air was still. Then, he saw a large black cloud coming down toward them. In minutes, day turned into night. (S9) ______. All the time, hot ash was raining on them. But other people were not so lucky. David Johnston, (S10) ______. Mount St. Helens is peaceful now. But its slopes are empty. It will be many years before fish, plants, and trees will again live on the mountain. S10