2 .
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 ... ... .
... water switch ... / ... water ladder.
... lock ... / ... flight of locks.
... slide ... / ... set of slides.
... changer ... / ... water-climb.
Answer 1 would not give you a particularly 'country' walk (all on roadways), although you might avoid getting much mud on your boots!