twenty­first century.But the two tallest buildings in the US were built much 2.earlier(early)．In fact，the 3.second (two) tallest building in the US is more 4.than 75 years old!

　　The Empire State Building，which 5.was (be) the tallest building at the time 6.was finished (finish) in May 1931.It was the tallest building in the world 7.until the World Trade Centre 8.was built (build) in New York in 1972.The World Trade Centre twin towers，9.which were destroyed in September 2001，were 417 and 415 10.metres(metre) high.

　　Ⅰ.单词拼写

　　 根据汉语或首字母提示，写出下列单词

　　1．I'm not going out without hat and scarf-it's freezing(极冷的) out there!

　　2．It is difficult to travel through the city on a foggy(有雾的) day.

　　3．Officials from Greenwich Observatory (观察台) have the clock checked twice a day.

　　4．The plane crashed(坠毁)，causing more than 200 deaths yesterday.

　　5．The team has made enormous efforts to make the match a success.

　　6．What he said just now was ridiculous．None of us believed it.

　　Ⅱ.拓展词汇

　　根据词性和汉语提示，写出下列单词

　　1．freeze v．使结冰；冷藏→frozen adj.结冰的；冻结的→freezing adj.冷冰冰的；极冷的

　　2．ridiculous adj.荒唐的→ridiculously adv.荒唐地

　　3．enormous adj.巨大的→enormously adv.非常

　　4．observe v．观察→observation n．观察→observatory n．观察台

　　5．fog n．雾→foggy adj.有浓雾的

　　Ⅲ.补全短语

根据提示补全下列短语