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Bonjour,
a. Astronauts will be able to go on a spacewalk.
b. I will have to speak English to sign up for Mars One.
c. When they arrive on Mars, they will have to build everything.
d. After the final selection, the chosen astronauts will not be permitted to resign.
Voilà, j'espère que ma réponse t'aura aidé(e) :)