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1.The first modern military submarine...........by a combination of diesel and electric engines (POWER)
2.It was developed by the irish inventor John.P Holland in 1901.Many submarines.............to appear at the end of the 19th century in France and the United States (BEGIN)
3.When...........on the surface,a diesel engine is used to drive the propeller and push the submarine through the water.An electric motor is used for underwater operations (TRAVEL)
4.Since 1954,many submarines...........on nuclear-powered engines (RUN)
5.These enable submarines............ hidden underwater for months at a time without refueling (STAY)

Answer 1

powered

began

traveled

ran

stayed

Answer 2

1was powered

2began

3travelling

4 have run

5stay