In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.

In the early 1920's, setters came to Alaska looking for (1) ____________ . They travelled by boat to the coastal towns of Seward and Knik, and from there by land into the gold fields. The trail they used to (2) ____________ inland is known today as the Iditarod Trail one of the National Historic Trails designated (3) ____________ the Congress of the United States. The Iditarod Trail quickly became a major thoroughfare in Alaska, as the mail and supplies were (4) ____________ across this trail. People also used it to get from place to place, including the priests, ministers, and judges who had to travel between villages. In the winter, the settlers' only means of travel down this trail was via dog 5) ____________.