Even if you are one of the best students in class, in order to maintain your grades you must review your lessons often.
3) 过去有关太空时代的某些幻想已经成为现实。
Some of the old fantasies about the space age have come true.
4) 情况确实是如此，有些人一生中很早就获得成功，而另一些人则要工作很长时间方能实现自己的目标。
It is true that some people achieve success very early in life, while others must work a long time before attaining their goals.
5) 他坚持认为这次实验的失败主要由于准备不足
(inadequate)。
He maintained that the failure of the experiment was largely due to inadequate preparation.
6) 如今研究人员提倡我们应该每天花些时间将自己想要达到的目标投射到心灵的屏幕上。
Researchers now recommend that we take time every day to project our desired goals onto the screen in our minds.