Gap Fill - Moon Bases - Level 0

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   actual      building      cheaper      dust      materials      mixture      money      new      tests      they  

Paragraph 2

The concrete could save . It costs $10,000 to take 0.45kg of to the Moon. The urine and moon would be . A scientist said: "The water in the urine could be used for the ." Scientists say need to do more to find the best material.

Try the Moon Bases - Level 1 gap fill.

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