世界上最大的天然橡胶生产国是（　　）

在下面一段文字横线处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密。每处不超过15个字。

    海岸侵蚀是由于海水动力的冲击造成海岸线后退和海滩下蚀的地质现象，导致海岸侵蚀的原因虽然有很多，①____。例如：沿岸采沙直接减少了海岸陆域面积，沿岸开采地下水使地基产生沉降，而开采珊瑚礁、采伐红树林等活动则使海岸失去庇护。②____，我国则是侵蚀灾害最为严重的国家之一。在防治海岸侵蚀时，一些欧美国家在重要的岸段划有预警线，③____。而在我国不少的旅游海岸，别墅和娱乐设施直接建在沙滩上，这就极易酿成灾祸。

These days computer games are becoming more and more popular in many cities and towns. A lot of small shops along the 1have changed into computer game houses in order to get more 2. These places are always crowded with people.
In the computer game houses, people 3a lot of money matching on the machine. It’s 4for one to beat a computer, but one can do well after trying again and again. People want to 5when they play computer games. The more they 6, the more they want to win, and at last they even can’t 7without it.
The result(结果) is that some people don’t want to 8and they play in computer game houses for hours and hours. For school boys, things are 9. They don’t want to have 10. When school is over, they rush to the computer game houses near their 11. Some of them can get enough money from their 12. Some of them are not 13 enough to get the money. So they have to steal（偷） or rob（抢） others’ money and become 14.
Computer game addiction(上瘾) is a(n) 15problem in our life. Something has to be done to stop it.