1) The alien _________ (study) English.  a) has been studing b) have been studing 2) The astronauts _________ (not/explore ) space. a) hasn't been exploring b) haven't been exploring 3) We _________ (miss) the flight to Mars, but we can take the flight to the moon. a) has been missing b) have been missing 4) She _________ (live) on Saturn, but never on Earth. a) has been living b) have been living 5) I _________ (travel) on a spaceship three times. a) has been travelling b) have been travelling 6) Scientists _________ (work) for many years to send astronauts to Mars. a) has been working b) have been working 7) James _________ (save) a lot of money to buy a star. a) has been saving b) have been saving 8) I _________ (not/try) to visit Jupiter. a) hasn't been trying b) haven't been trying 9) The explorer _________ (carry) a very heavy bag across the mountains. a) has been carrying b) have been carrying 10) Amanda _________ (not/pass) any of her exams. a) hasn't been passing b) haven't been passing 11) I ______________ on this project for a week. a) has been working b) have been working 12) They _________________ up this mountain for over two hours. a) has been climbing b) have been climbing 13) My mother _________________ for you since 10 am. a) has been waiting b) have been waiting 14) My best friend _____________________ for two hours. a) has been singing b) have been singing 15) The baby _____________________ out loud. a) has been crying b) have been crying 16) I _____________________ about you since you called. a) has been thinking b) have been thinking 17) They ___________________________ on this project for a week. a) hasn't been working b) haven't been working

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