结构分析：本句是 “主语＋谓语”的结构，amazed 作伴随状语，后面两个as 引导的从句都是时间状语从句(第一个as意为“当……时候”， 第二个as意为“随着”)。

　　一、语法填空。

　　1．________ we left, Li Yanping explained to me that the force of gravity would change three times 2.________our journey and that the first change would be the most powerful.Then we were off.As the rocket rose into the air, we 3.______________ (push) back into our seats because we were trying to escape the pull of earth's gravity.It was so hard that we could not say 4.________ to each other.Gradually 5.________ weight lessened and I was able to talk to him.“Why is the spaceship not falling 6.________to the earth? On the earth if I fall from a tree I will fall to the ground，” I asked.

　　Before　

　　on

　　were pushed

　　anything

　　the

　　back

　　“We are too far from the earth now 7.________ (feel) its pull，” he explained, “ so we feel as if there is no gravity at all.When we get 8.________ (close) to the moon, we shall feel its gravity pulling us, 9.________ it will not be as strong a pull as the earth's.” I cheered up immediately and floated weightlessly around in our spaceship cabin 10.________ (watch) the earth become smaller and the moon larger.

　　to feel

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