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spaceship
project
astronauts
space travel
space travel
C
A
B
C
A
B
Have scientists sent a spaceship to Mars?
have sent
Yes, they have.
has taken
Has the journey taken several months?
Yes, it has.
has arrived
Has the spaceship arrived yet?
Yes, it has.
haven’t discovered
Have the scientists discovered life on Mars?
No, they haven’t.
have been to
Have astronauts been to the moon?
Yes, they have.
work hard