简答题：Directions：In this section，you will hear a passage three tim

Directions：In this section，you will hear a passage three times．When the passage is read for the first time，you should listen carefully for its general idea．When the passage is read for the second time，you are required to fizz in the blanks numbered from 72to79 with the exact words you have fust heard．For blanks numbered from80 to82 you are required to fill in the missing information．For these blanks，you can either use the exact words you have just heard or write down the main points in your own words．Finally．when the passage is read you the third time，you should check what you have written．
The Revolutionary War，which began officially on April 19，1775，dragged on for more than six bitter years．It was a(72)____fought by the colonials for the honorable cause of securing freedom from intolerable British intervention in American affairs．When legal restrictions were (73)____by both the British and the colonists in 1775，nearly all American(74)_____commerce abruptly ceased．By mid-1775，the colonies faced acute shortages in such military(75)_______ as powder and knives．Even salt，shoes，woolens，and linens were in short supply．Late in 1775，Congress(76)____limited trade with the West Indies，mainly to buy arms and ammunitions．and trade with other non-British areas was on an(77)_____basis by the spring of 1776．
Nevertheless，the British maintained a fairly effective naval blockade of American ports，especially during the first two years of the war．Yet the colonies(78)____in international trade despite the blockade．Formal(79)____of commerce with France in l778 and with Holland and Spain shortly thereafter stimulated the flows of overseas trade．Between 1778 and early 1782．American wartime commerce was at its prime time．(80)____________________________________．Even so，the flow of goods in and out of the colonies remained well below pre-war levels．(81)_______．Even coastal trade was curtailed by a lack of vessels，by blockades，and by wartime freight rates．(82)_______________________________________________．
填入(72)中的答案。