Today, most countries in the world have canals. Many countries have built canals near the coast, and parallel -1- the coast.Even in the twentieth century, goods can be moved more cheaply by boat than by any other -2- of transport. These

-3- make it possible for boats to travel -4- ports along the coast without being -5- to the dangers of the open.Some canals, such as the Suez and the Panama, save ships weeks of time by making their -6- a thousand miles shorter.Other canals permit boats to reach cities that are not -7- on the coast, still other canals -8- landsswheresthere is too much water, help to -9- fields wherethere is not enough water, and -10- water power for factories and mills.The size of a canal -11- on the kind of boats going through it.The canal must be wide enough to permit two of the largest boats using it to -12- each other easily.It must be deep enough to leave about two feet of water -13- the keel of the largest boat using the canal.When the planet Mars was first -14- through a telescope, people saw that the round disk of the planet was criss-crossed by a -15- of strangeblue-green lines. These were called "canals" -16- they looked the same as canals on earth -17- are viewed from an airplane.However, scientists are now -18- that the Martian phenomena are really not canals. The photographs -19- from space-ships have helped us to -20- the truth about the Martia "canals".

1. [A] off　[B] with [C] to　 [D] by

2. [A] way　[B] means [C] method　 [D] approach

3. [A] waterways [B] waterfronts [C] channels [D] paths

4. [A] among [B] between [C] in　 [D] to

5. [A] revealed [B] exposed [C] opened　 [D] shown

6. [A] trip [B] journey [C] voyage　 [D] route

7. [A] lain [B] stationed [C] set　[D] located

8. [A] escape　 [B] drain [C] dry　[D] leak

9. [A] water[B] wet [C] soak [D] irrigate

10. [A] furnish　[B] afford [C] offer[D] give

11. [A] focuses　[B] bases [C] depends　[D] takes

12. [A] cross [B] pass [C] move [D] advance

13. [A] down [B] below [C] beneath　[D] off

14. [A] studied　[B] researched [C] surveyed [D] observed

15. [A] few　[B] number [C] deal [D] supply

16. [A] although [B] because [C] so　 [D] if

17. [A] that [B] where [C] when [D] as

18. [A] exact [B] definite [C] certain　[D] decisive

19. [A] held [B] taken [C] got　[D] developed

20. [A] find [B] expose [C] uncover　[D] discover