3．________it was to become was a mystery ________the dust began to slowly combine into a ball ________(move) around the sun.

　　4．It exploded loudly ________ fire and rock，________ were in time to produce the water vapour, carbon dioxide, oxygen, nitrogen and other gases, ________ were to make the earth's atmosphere.

　　as　

　　to be

　　What

　　until

　　moving

　　with

　　which

　　which

　　5．It allowed the earth ___________(dissolve) harmful gases，________ had become part of the earth's atmosphere, into the oceans and seas.

　　6．Scientists believe that taking carbon dioxide ________ the atmosphere and ________(fill) the air ________ oxygen helped life to develop.

　　7．Last month I was ________ (luck) enough to have a chance ________(make) a trip into space with my friend Li Yanping, an astronomer.

　　8．I cheered ________ immediately and floated weightlessly around in our spaceship cabin ________(watch) the earth become________ (small) and the moon larger.

　　to dissolve

　　which

　　from

　　filling

　　with

　　lucky

　　to make

　　up

　　watching

　　smaller

　　9．Walking does need a bit of practice ________ that gravity has changed.

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