A. ITS B. THEIR C. IT D. THEIRSB. READ THE PASSAGE CAREFULLY, THEN...

5. A. its B. their C. it D. theirs

B. Read the passage carefully, then choose the correct answers: (1.25 p)

Between the Revolutionary period and the World War I, the United States post office was set out to improve

transportation of the post office mails. From those early days to the present, the post office has helped develop and

subsidize every new mode transportation in the United States. Transportation has been the most important element in

mail delivery. Even when the general public had still suspected of the security of a new means of transportation, the

post office experimented with inventions that offered potential for moving the mail faster, occasionally suffering

embarrassment, ridicule, or even abuse in the process.

As mail delivery evolved from foot to horseback, stagecoach, steamboat, railroad, automobile, and airplane, with

intermediate and overlapping use of balloons, and helicopters, post office mail contracts ensured the income necessary

to build the great highways, rail lines, and airways that eventually spanned the continent.

By the turn of the 19

century, the U.S. Post Office had purchased a number of stagecoaches for operation on the

nation’s better post roads – a post road being any road on which the mail travels – and continued to encourage new

designs to improve passenger comfort and carry mail safely.