Scientists have always wanted to know more a___ the other worlds in space.
Years a___,they knew many facts about moon .They knew h___ big it was and how far away.But they w__ to know more about it.They thought and thought.At last they f___ the only way to send m___ to the moon.
The moon is about 384000 kilometers away from the e___.A plane can't fly to the moon because the air reaches only 240 kilometers.Then there is no air.But s___ can fly even when there is no air.That is a rocket.
Rockets can fly far out into s___.Rockets with men in them have already reached the moon.Some rockets without men in them have flown to other planet much f___ away than the moon.One day rockets may be able to go to any place.

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Scientists have always wanted to know more a_bout__ the other worlds in space.
Years a_go__,they knew many facts about moon .They knew h_ow__ big it was and how far away.But they w_anted_ to know more about it.They thought and thought.At last they f__ound_ the only way to send m_en__ to the moon.
The moon is about 384000 kilometers away from the e_arth__.A plane can't fly to the moon because the air reaches only 240 kilometers.Then there is no air.But s_omething__ can fly even when there is no air.That is a rocket.
Rockets can fly far out into s_pace__.Rockets with men in them have already reached the moon.Some rockets without men in them have flown to other planet much f_ar__ away than the moon.One day rockets may be able to go to any place.