Choose the answer that best fills the gap/s in sensible, accurate English.The place where boats can transfer safely to a higher or lower water level, in a separate section of a river or canal, is called a ... ... ; and if there are several of these one after the other, the whole set is known as a ... ... .

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Choose the answer that best fills the gap/s in sensible, accurate English.<br />The place where boats can transfer safely to a higher or lower water level, in a separate section of a river or canal, is called a ... ... ; and if there are several of these one after the other, the whole set is known as a ... ... .





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