Pu the verbs in brackets in either the Present Perfect or the Present Perfect Continuous
1)Richard Branson,owner of Virgin Atlantic,_________(fly) balloons for many years.He still flies them today.
2)I know he ________(make) a transatlantic flight,but I'm not sure when.
3)_____you ever____(see) a hot-air balloon?
4)Scientists _____(work)on a new plane but the work is not finished yet.
5)John Glenn _________(orbit) the Earth many times in is life.
6)Mir,the space station,________(orbit) the Earth non-stop since 1986.
7)Captain Lewis is a very experienced Concorde pilot.He ______(fly) the supersonic plane for ten years.
8)They ________(build) a new terminal in the city so more airlines can use the airport now.