请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。

(1)In the modern world, we should pay more attention to food. We should eat very ____ .
(2)Today is Children's Day. The children are enjoying ____ festival now.
(3)To support a big family, his father has to look for a ____  job besides delivering newspapers and milk.
(4)For your____ , you mustn't stand under the tree when it's raining in summer.
(5) Last month, Mrs Obama, U.S. First Lady, paid a week-long visit to China focusing on ____. She visited some schools and universities.

“碧玉妆成一树高，万条垂下绿丝绦”能发育成万千枝条及其绿叶的结构是（　　）

常见的河流侵蚀地貌是（   ）

完形填空

            As scientists learn more about the causes of earthquakes, they become better able to predict them. First of all, they know that quakes are1to occur in areas where the tectonic(地壳构造的)plates push2each other. They3these areas closely, using different instruments. They4the vibrations(震动)of the earth with seismographs(地震仪), which5on rolls of paper all movements, both large and small. Scientists usually use the Richter scale(里氏震级)，6after a famous seismologist, for these measurements. When an earthquake measures over 4.5 on the Richter scale, it is7enough to cause damage. Scientists have determined that a(an)8is not likely to have a large9when many small quakes have been10. When the small quakes stop, then pressure11and a strong quake is more likely.

          There are several other12to predict earthquakes. Scientists can measure the tiny13in the tilt(倾斜)of the land that happen before an earthquake occurs. Increases in the amount of radon(氡), a substance found in deep14， as well as a high level of water in the wells, can also15that an earthquake is likely to occur. In addition, scientists have found that some animals, like dogs, behave16before an earthquake: they become17and howl.

           Seismologists have18_predicted several earthquakes, such as the earthquake which occurred in Zhangjiakou, China in 1998. 19，  not all earthquakes are predictable, and a system for predicting is not yet20.