Some canals,such as the Suez of the Panama,save ships weeks of time by making their voyage a thousand miles shorter.Other canals permit boats to reach cities that are not（ ）on the coast,still other canals drain lands where is too much water,help to irrigate fields where there is not enough water,and furnish water power for factories and mills.

Some canals,such as the Suez of the Panama,save ships weeks of time by making their voyage a thousand miles shorter.Other canals permit boats to reach cities that are not（ ）on the coast,still other canals drain lands where is too much water,help to irrigate fields where there is not enough water,and furnish water power for factories and mills.