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2.John Lennon was singing on stage when he was killed.
3.We`ve been in class for eight hours.
4.Gagarin flew to space in 1969.
5.We`ve sitting at home.
6.We`ve been studying English for twelve years.
7.The sun rises in the west.

2.Was John Lennon singing on stage when he was killed? 3. Have we been in class for eight hours?4. Was Gagarin flew to space in 1969?5. Have we been sitting at home?6. Have we been studying English for twelve years?7. Does the sun rise in the west?