结合语境，根据汉语或首字母提示用单词的适当形式填空。

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1．每处错误及其修改均仅限一词；

2．只允许修改 10处，多者（从第11处起）不计分。

    Most students go to Internet bars play video games, that takes much of their precious time. Some students even stayed in Internet bars day and night, forgot their studies. No doubt these students will finally end up with their bright future destroy. Furthermore, some student log onto unhealthy websites accidental. And they are finally absorbed to the excitement of reading unhealthy stories or watching dirty videos. All these are harmful to the teenagers and if only this is not controlled or the use of the Internet is not properly guided, some of us will go the wrong way.

    The First Americans

    There was a time long ago when a land bridge connected Asia and North America. The first settlers in North America crossed this land bridge from what is now Siberia to Alaska. The people who made this initial crossing were probably following the animals they used for food.

    Finally, the oceans rose and the land bridge between the continents disappeared. The settlers, who I shall call the “First Americans”， could not return to their homeland.      

    For the next few thousand years, the First Americans moved south and east throughout North and South America. They made the journey all the way from Alaska to the southern tip of South America, a distance of more than 10,000 miles.      

    In the far north, above the Arctic Circle, the First Americans became hunters of the ocean.      In the summer, they gathered berries and other plants. In the winter, they stayed in lodges much of the time preparing for the next summer. It was a hard life, but they learned to survive in these terrible conditions.

    Farther south, in what is now Arizona, Utah, Colorado, and New Mexico, the First Americans became cliff dwellers. They began by living in caves that already existed in the cliffs.      The dwellings they built in many ways resembled today's apartment buildings.

           They built a system of dams and canals so they could store and use water almost any time of the year. They were so successful that they could raise fruits and vegetables that were not found naturally in the desert.

A．They also discovered foods like corn and potatoes.

B．Along the way, they established many different civilizations.

C．They discovered how to add to the caves by building structures of wood and stone.

D．People living near each other tended to share similar environments and customs.

E．They built boats of animal skins and hunted or fished for their food.

F．They would have to survive in the New World they had discovered.

G．The First Americans of the Southwest learned to water the desert.