Seven sentences have been removed from the article. Choose from sentences A-H the one which fits best each gap. There is one extra sentence.
NASA, the government-owned space program, once aimed to develop a re-usable rocket.1 ___ It plans to launch a manned expedition to an asteroid by 2025 and since this will require different technology, it is more likely that people outside the NASA program will develop re-usable rocket design.
Rick Tumlinson, co-founder of the Space Frontier Foundation (SFF),has spent the past two decades pushing for human exploration and settlement of the solar system. Space News magazine described him as one of the 100 most influential people in the space industry. Tumlinson has always maintained that businesses should get involved, and views NASA as a bit of a dinosaur.
A At the same time, the SFF accepts that NASA's missions could bring other scientific benefits.
B More than one such firm has developed impressive solutions for getting into space and back cheaply
C Commercial activity such as this is what the private sector should be doing.
D However, the USA's priorities have changed in the 21st century.
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E Here again, private companies may well prove them wrong in | the very near future
F The SFF's own view has always been that it is impossible for NASA to offer an 'open frontier'.
G In an early article he wrote about the government-owned space program, he made the following observation.
H SpaceX is prepared to meet this need - and at less than half the cost.