10.4.7 For each gap 1-7, choose from the 3
sentences A-H the one that best fits each
gap. One sentence is extra. Compare with
your partner. Justify your answers.
A Humans would need to be self-sufficient to
survive in space long-term.
B The only question is whether this happens in
years, centuries or millennia.
C Exploring space, however, is not without risk.
D This costs a lot of money.
E Nevertheless, Professor Hawking believes that
we can afford to give 0.25% of the world's
financial resources to colonise space.
F He believes that sooner or later we will be wiped out
by a catastrophe such as a meteor or nuclear war.
G That way, we could reach the next star to Earth
in just 6 years.
H However, even if we found the perfect planet, we
might not be able to get there at the moment.​