近年来，美国与中国周边国家日本、菲律宾频繁军演，插手中国东海、南海事务，其狼子野心与上世纪初的行为如出一辙。最近又在韩国部署“萨德”有进一步的行动。上世纪初，美国为争夺亚太地区的霸权（     ）

如图所示，两个质量均为m的小环套在一水平放置的粗糙长杆上，两根长度均为l的轻绳一端系在小环上，另一端系在质量为M的木块上，两个小环之间的距离也为l，小环保持静止．试求：

    I asked many classmates and friends， “What do you think you will be1 you grow up?” Some of them told me what they would like to be in the future，2 others said， “I don't know.” I'm 3 to hear that because I think it's bad. I think having dreams or hopes about the future will help us do better at school.

    As middle school students， it's time for us to 4 what we want to be in the future. If we know it better， we will know 5 to do it better at school. For example， if you are outgoing and like to meet people， you can be a 6 in the future. Then you should practice writing more articles. If you're 7 with children and like 8， you can teach English as a job in the future. And then you should work harder at English. If you want to 9 many interesting places， you can be a guide.

    Of course， all the 10 that we are learning at school will be useful in the future， so we should work hard at all of them.