哲学家黑格尔说过：自杀是一种“自卑的勇敢”，这是一种不负责任的愚蠢行为。这句话告诉我们（    ）

①自杀是一种勇敢的行为       ②要热爱生活

③要珍爱生命                           ④要对自己的行为负责任

观察下列各式：

$\sqrt{1+\frac{1}{1^2}+\frac{1}{2^2}}$  =1+ $\frac{1}{1}$ ﹣ $\frac{1}{2}$  =1 $\frac{1}{2}$

$\sqrt{1+\frac{1}{2^2}+\frac{1}{3^2}}$  =1+ $\frac{1}{2}$ ﹣ $\frac{1}{3}$  =1 $\frac{1}{6}$

$\sqrt{1+\frac{1}{3^2}+\frac{1}{4^2}}$  =1+ $\frac{1}{3}$ ﹣ $\frac{1}{4}$  =1 $\frac{1}{12}$

请你根据上面三个等式提供的信息，猜想：

    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.