Question

Put the verbs in brackets in either the Present Perfect or the Present Perfect Continuous.
1. _____ you ever _____ (see) a hot-air balloon?
2.Scientists _______ (work) on a new plane but the work is not finished yet.
3.John Glenn _____ (orbit) the Earth many times in his life.
4.Mir, the space station, _______ (orbit) the Earth non-stop since 1986.
5.Captain Lewis is a very experienced Concorde pilot.He ____ (fly) the supersonic plane for ten years.
6.They _____ (build) a new terminal in the city so more airlines can use the airport now.
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Answer 1

1. Have you ever seen
2. Scientists are working
3. John Glenn has orbited
4. is orbiting
5. He has flown
6. they are building