第二节 语法填空（每小题1.5分，满分15分）
Haroun Tazieff, the Polish scientist, has spent his lifetime _____31_____(study) active volcanoes and deep caves in all parts of the world. In 1948, he went to Lake Kivu in the Congo to observe a new volcano ____32____ he later _____33____(name) Kituro. Tazieff was able to set up his camp very close ____34____ the volcano while it was erupting _____35______(violent). Though he managed to take a number of brilliant photographs, he could not stay near ____36____ volcano for very long. He noticed that a river of liquid rock was coming towards him. _____37_____ threatened to surround him completely, ____38____ Tazieff managed to escape just in time. He waited until the volcano became quiet and he was able to return two days later. This time, he managed _____39_____(climb) into the mouth of Kituro so that he could take photographs and measure temperatures. Tazieff has often risked his life in this way. He has been able to tell us ____40_____ about active volcanoes than any man alive.
