I Fill in each blank with the proper word according to the initial and the definition of the word.WANTED: Young skinny, w______ fellows not over eighteen. (--thin but strong)The Pony Express, nevertheless, has become s_________ with the Old West. (--having the same, or nearly the same, meaning)By the 1840s the influx of p_____ to the Northwest, and the flood of prospectors to California after 1848 had created an increasing demand for mail delivery to and from the East. (--the first people to go to a particular area in order to live and work there)Later this route was ultimately j________ by growing North-South tension. (--cause sth. to be harmed, lost or destroyed; put in danger)They switched m______ every 10-12 miles. (--a horse that you ride on)This relay system allowed mail to criss-cross the f______ in record time. (--the edge of land where people live and have built towns, beyond which the country is wild and unknown, especially in the western US in the 19th century)It was just a group of c_______ riders who had proven their loyalty again and again. (--willing to work hard and give your time and energy to sth)What caused the d______ of the Pony Express? (--the end or failure of an institution, an idea, a company, etc.)Despite the failure, the founders’ ability to assemble and operate this remarkable service under especially challenging circumstances was a tribute to their courage and i_______. (--the ability to invent things or solve problems in clever new ways)In the game, a Pony Express rider controlled by the game player has to avoid obstacles and pick up letters in search of the e______ 100 percent rating. (--difficult to find, define, or achieve)