Present perfect simple and continuous B1+

Complete the interview with an American hurricane expert with the present perfect simple or continuous form of the verbs in Brackets . Use the present perfect continuous whenever posible .


How do you track or follow a hurricane ?

Well , we ____________________ ( use ) satellites to track hurricanes for many years now . In the last year , weather satellites ____________________ ( help ) us to find and follow the progress of a number of hurricanes . Fortunately , all of these hurricanes ____________________ ( leave ) our region and are no longer dangerous .

Do you only use satellites ?

Well , no . Since 1965 , the US Air Force ____________________ ( use ) special planes called 'hurricane hunters' to monitor hurricanes .
The hurricane hunters ____________________ ( become ) very good at collecting information about extreme weather conditions .

What do experts do with the information ?
Well , over the past few years , we ____________________ ( develop ) better ways of using the information from planes and satellites .
In the last year , we ____________________ ( be ) able to use very complicated computer models to show possible hurricane movements . In my opinion , our work ____________________ ( save ) the lives of between fifty and a hundred people in the last six months .