Ответьте на вопросы, следуя образцу, и запишите их.
which is longer: a mile or a kilometer? A mile is longer than a kilometer.
 which is longer: an hour or a minute? 
 which is bigger: a ship or a bus?
 which is longer: a sea or a river?
which is more difficult: to go on foot or to go by train?
 

 An hour is longer than a minute.  A ship is bigger than a bus.  A sea is longer than a river. To go on foot is more difficult than to go by train.