The rockets take astronauts and man-made satellites into space. The satellites are used for communication, weather monitoring and research. But how do satellites stay up without falling down?
There are two opposite forces (力量) acting on the satellite. One of them is the force of gravitation (地心引力), which tries to pull the satellite towards the earth. The other force is created by the rotation (旋转) of the satellite around the earth. This force tries to take the satellite away from the earth. With these two forces, the satellite goes round and round. The gravitational pull of the earth (the force which pulls everything towards the ground) is like a rope which keeps the satellite from flying away.
Everything that goes up has to come down. It is only a matter of time before a satellite comes back to the earth. As time goes by, the satellite loses its speed, which makes the gravitational pull stronger than the force pulling it away. This makes the satellite crash (坠落) down to the earth.
【小题1】Which of the following uses of satellites is NOT mentioned?

根据汉语意思，完成下列句子。（每小题2分，共5小题，计10分）
【小题1】你给我这么多帮助，你真好。
               to give me so much help.
【小题2】大部分时间我们都在一起；因此我们从不觉得寂寞。
We are together most of the time, so we              
【小题3】珍爱自己，远离不健康的书。
Take good care of yourself and              bad books.
【小题4】近五年来在西昌已发射了几颗人造卫星。
Several man-made satellites             in Xichang in the past five years.
【小题5】我认为自己想办法要比仿照别人的样子要好。
I think it’s better to find our own way than             .  

_________ the help of man-made satellites, we can know what the weather will be like

in the next few days.