A person who travels in space
A system of millions or billions of stars.
The number of _______ in the Earth*s orbit at the moment is estimated to be 2271.
This new rocket is a ________ which can carry fifteen astronauts.
If I had enough money, I ______ a telescope.
I ________ more if I had more time.
If I pass my exams, my parents ______ happy.
If the computer gets too hot, _______ it off.
If I hadn*t studied engineering, I _______ become interested in space travel.
I would have come and found you, If I ________ you were at the party.
The clothest ______ to Earth is Venus , which is over forty billions kilometres away.
four billion eight hundred and seventy-two thousand three
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