Read the article below and decide which answer best fits each space. Đọc đoạn văn dưới và chọn từ thích hợp cho mỗi chỗ trống.


Truly one of the great engineering feats of all time, the Panama Canal was designed at the ___(1)___ of the 20th century and has been operating since 1914. It is 50.72 miles long, some of it hewn from solid rock, and gives ___(2)___ to all types of vessels, from huge tankers to the Queen Elizabeth II. A canal across Central America ___(3)___ dreams of a short route from Atlantic to Pacific ports by ___(4)___ships to enter the Pacific Ocean without traveling entirely around South America. The United States built the ___(5)___ at a cost of about $380 million. Thousands of laborers worked on it for about 10 years, using steam shovels and dredges to cut (6) _______ jungles, hills and swamps. They removed 211 million cubic yards of earth and rock and had to ___(7)___ malaria and yellow fever. The canal has three sets of water-filled chambers (locks), which raise and lower ___(8)___ from one level to another. The locks were built in pairs to allow ships to pass through in both ___(9)___ at the same time. The United States has controlled the Panama Canal Zone and the canal since 1903. However, a treaty approved by Panama’s voters in 1977 and by the U.S. Senate in 1978 will give Panama ___(10)___ of the canal on Dec. 31, 1999.