In the following questions, the 1st and the last sentence of the passage are numbered 1 and 6, The rest of the passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence and find out which of the four combinations is correct. Then find the correct answer 1. Today, the earth has many satellites besides the moon. P. But the pull of the earth keeps them from doing so. Q. The artificial satellites do not fall because they are going too fast to do so. R. They are the artificial satellites made by man and very much smaller than the moon. S. As they speed along they tend to go straight off into space. 6. Thus, they travel in an orbit around the earth.