Exercise II

　　1. Fill each of the numbered blanks in the following passage with one suitable word.

　　Between 1820__________ (1) 1860, _________ (2) United States underwent three significant changes: wares ___________ (3) immigrants flooded the port cities; the non-Anglo San population greatly _________ (4); and cities grew__________ (5) a rapid ___________ (6). Proud defenders of the Old Republic felt that_________ (7) changes, taken___________ (8) a whole, constituted a threat to American society. The massive immigration was larger and more rapid_________ (9) any________ (10) the past. No legal restrictions inhibited the stream___________ (11) those seeking a new life___________ (12) the Atlantic. About 5,000,000 immigrants__________ (13) to America between 1820 and 1860, half of __________ (14) arriving after 1850. A small nation _____________ (15) 10,000,000 in 1820 was transformed__________ (16) a giant of 31,000,000___________ (17) 1860.

　　Many of the newcomers brought__________ (18) them a war of__________ (19)which__________(20) radically from that of America.