Complete these either ... or ..., neither ... nor ... or both ... and ...1) ... can fly2) ... was/were invented in the 20th century3) ... can be used as fuel for space rockets4) ... can be called (an) aircraft5) was/were discovered by the English6) is/are in the Souuthern Hemisphere7) ... is/are done by computers8) ... is/are heavenly bodies9) ... can imitate human voices

Neither penguin nor ostrich can fly. Both the Internet and mobile devices were invented in the 20th century. Neither petroleum nor oil can be used as fuel for space rockets. Either an airplane or a helicopter can be called an aircraft. Both pencil and radio communication were discovered by the English. Both Southampton and Portsmouth are the Southern Hampshire. Either recognizing human emotions or creating realistic virtual universe are done by computers. Both stars and comets are heavenly bodies. Either elephants or parrots can imitate human voices.