English prepositions of off exercises

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• Come off the grass, don't trample on it.
• The carving of his famous alter-piece took twelve years of his life.
• Tight boots are sometimes difficult to take off one's feet.
• He fell off the top of the building.
• The professor couldn't answer this question off hand.
• A considerable part of the ruined city has already been rebuilt.
• From this hill you get a very good view of the whole city.
• Machines are made of metal.
• Have you heard of the night train that went off the rails?
• We have just been speaking of you.