On February 16, 1861, a big earthquake struck Sumatra, an Indonesian island. The earthquake shook the western side of the island,     1     (cause ) a tsunami. That wall of water poured onto shore, destroying towns and taking thousands of    2     (life) .

Recently, though, a team of scientists discovered that another earthquake occurred before this deadly event. According to the record, that earthquake     3     (start) in 1829 and lasted for 32 years but no one felt even one shake. This kind of slow-moving earthquake    4     (call) “silent earthquakes” because no instrument can find them. Scientists have only begun discovering them because    5     the advances in GPS technology in the last twenty years.

    6     (find) out what is going on under the ground, scientists need to study earthquakes. Every earthquake, either small     7     big, can teach scientists something about how much the ground will shake in the future. Unluckily, no one can predict (预测) when an earthquake will hit. Scientists just have to prepare to study all earthquakes    8     hit.

But silent earthquakes like the one in Sumatra change the game for scientists. These silent earthquakes happen all over    9     world. Sometimes, a silent earthquake happens just before a regular one, both of which might be related. By studying silent earthquakes, scientists hope to better understand regular earthquakes and    10    (possible) predict them.

With the rapid extinction of many wild species, more and more people come to realize the great importance of wildlife protection.

We have to understand the problem in     1     new light: we protect ourselves through protecting wildlife. On the one hand, any species of wildlife helps to keep the ecological balance(生态平衡).     2     one species becomes extinct, it will disappear forever. What is more, it will result     3     the extinction of a chain of wildlife, which may lead to unpredictable disasters. On the other hand, the modern science and technology makes     4    possible for us to learn more about wildlife. By now, scientists     5    (find) that wildlife has unknown genetic codes(遗传密码), which may turn out     6     (free) human beings from serious diseases and     7     (nature) disasters in the future.

It is necessary for us to protect wildlife     8    (immediate) before it is too late, although man has already polluted the environment and threatened the     9    (exist) of many wild species. Let’s take action to protect wildlife.     10    (learn) to live in harmony with all wildlife is part of modern civilization.