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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