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1. Submarine tubes are closed ships that travel inside the sea..
 
2. We can expect the author's visionary ideas, such as aero-cars and aero-trains, to become reality in the future, just as his futuristic internet did.
 
3. A machine helped Francis, in having his bath.
 
4. The author highlights the busy, sedentary lifestyle of people in 2889 through Francis Bennett's portrayal.