Last month I made a trip into space with my friend Li Yanping. We visited the moon in our spaceship.

Before we left, Li Yanping explained __________ me that the force of gravity would change three times on our journey and _________ the first change would be the most____________( power). Then we were off. As the rocket rose slowly into the air we began to feel ________ pull of the earth, which is _________ we called gravity. At first it pushed us _________ hard back into our seats that we could not say anything to each other.

________________(gradual) the weight lessened and I was able to talk to him. _________ we got closer to the moon, we felt its gravity pulling us but it was not as strong a pull as the earth’s. I cheered up immediately and floated_________________(weight) around in our spaceship cabin_______________(watch) the earth become smaller and the moon larger.