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 19th 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.