Ⅴ.短文填空:用方框中所给单词的适当形式填空,使短文完整正确。(每个单词限用一次,每空限填一个单词。)
because, quick, plan, hard, far, against, ground, light, happen, slow
Earthquakes can be so terrible. It is 20. to think that they happen by the thousands every day around the world. Most of them are small shakes.
Some 80 percent of all the planet's earthquakes 21. along the edge (边缘) of the Pacific Ocean. It is called the "Ring of Fire" 22. most of volcanic (火山的) activities take place there as well. Most earthquakes happen at fault zones (断裂带), where tectonic plates (构造板块) push 23. each other. These effects are usually 24. on the ground. It is not easy for people to notice. However, strong stress can build up between plates. When this stress is given out 25. . It sends a lot of shakes, often hundreds of miles through the rock and up to the 26. . Other shakes can happen 27. when plates are pulled or pushed.
Scientists give a magnitude rating (震级) to earthquakes. A shake measuring 3 to 5 is small or 28. ; 5 to 7 is moderate (适中) to strong; 7 to 8 is major (较强的), and 8 or more is great.
Loss of life can be avoided through good 29. when an earthquake comes.

20.hard 21.happen 22.because
23.against 24.slow 25.quickly
26.ground 27.far 28.light 29.plans