The alien _________ (study) English. , has studied, have studied, The astronauts _________ (not/explore ) space., has not explored, have not explored, We _________ (miss) the flight to Mars, but we can take the flight to the moon., has missed, have missed, She _________ (live) on Saturn, but never on Earth., has lived, have lived, I _________ (travel) on a spaceship three times., has travelled, have travelled, Scientists _________ (work) for many years to send astronauts to Mars., has worked, have worked, James _________ (save) a lot of money to buy a star., has saved, have saved, I _________ (not/try) to visit Jupiter., has not tried, have not tried, The explorer _________ (carry) a very heavy bag across the mountains., has carried, have carried, Amanda _________ (not/pass) any of her exams., has not passed, have not passed.

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