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哈勃太空望远镜.qsv
space travel
universe
spaceship
astronauts
space station
Mars
the sun
the earth
the moon
scientists
solar system
galaxy
group
space
Activity8
verbs(动词)
be(have been)
go(have gone)
discover
(have discovered)
arrive
(have arrived)
send(have sent)
reach
(have reached)
find(have found)
1.Scientists have sent spaceship to Mars.
4.Astronauts have already been to the moon.
2.The spaceship has been to Mars .