完型填空

What is the best way to study? This is a very important question. Some Chinese students often1very hard for long hours. It is a2habit, but it is not a better way to study. An efficient(讲效率的) student must3enough sleep, enough food and enough rest. Every week you 4to go out for a walk or visit some friends or some nice places. It's good5your study. When you return to your studies, you'll find yourself6han before and you'll learn more.

Maybe we can7that learning English is8taking Chinese medicine. We don't mean that it's bitter (苦的). We mean that like Chinese medicine, the efficiency of your study9slowly but surely.10slowly but surely every day and effects will come just like Chinese medicine.

 近年来，南海问题成为世界关注的焦点。当我们沿着历史的轨迹追寻国家兴衰之道时，就会深深感到正是海洋主宰着一个民族的盛衰荣辱。阅读下列材料回答问题：
材料一  l500年前后，世界终于冲破茫茫大海的阻隔，开始连成一个整体，海洋时代就此开启。然而中国，自郑和死后，中国人的身影就在海洋上消失了。从此，海洋带给中国人的不再是友谊和荣耀，而是噩梦的代名词，骨肉的离散与悲欢。
材料二 在内忧外患十分严重的形势下，清朝统治集团中的一些人认识到，要镇压人民起义，抵御外敌侵略以维护清朝统治，就必须学习西方先进军事技术。于是洋务派在举办近代工业的同时，用新式枪炮、轮船装备军队，改造陆军，建立新式海军。就这样近代意义上的中国水师(海军)诞生了，然而，随着北洋水师的全军覆没，中国水师不仅输给了日本，同时再次导致骨肉分离。

在${\left(2+x\right)}^5$的展开式中，$x^3$ 的系数为____ (用数字作答)。