Finish the following sentences.

1) Canalis a waterway dug across …

2) There are two major types of canals…

3) Navigation canals may connect …

4) Many navigation canals are parts of …

5) When planning a canal, builders first decide whether …

6) Canals are usually used for …

7) Engineers determine the course of a canal and decide whether it will need …

8) The construction of a canal primarily involves …

9) Canal locks are rectangular chambers that enable ships to move from …

10) Most locks are made of …

11) Locks are used to overcome …

12) The flow of water is carefully controlled to prevent the ship from …

Decide whether the following sentences are true or false according to the text.

1) Canals haven’t served as important means of transporting goods and water for thousands of years.

2) Navigation canals enable vessels to travel between bodies of water.

3) Irrigation canals and drainage canals are included in water conveyance canals.

4) Navigation canals may link two different waterways.

5) Canalized rivers are rivers whose navigable stretches are connected by a series of dams and locks.

6) Early canals were narrower than modern ones.

7) Builders consider the kinds of goods to be shipped in and out of an area.

8) Engineers don’t regard how a canal will affect surrounding plant and animal life.

9) The digging and moving of earth and rock is the first step in the construction of a canal.

10) All canals are lined with asphalt or concrete.

11) Some locks have watertight gates at each end.

12) Water flows in and out of locks by gravity.

13) Locks require a supply of water at the upper level of the canal.