单词拼写（共10小题；每小题0.5分，满分5分）（注意单词的正确形式）
81. One snowy night, all the streets were_____________(空无一人)
82. I’ve tried but I can’t h _________the problem by myself.
83.He’s alive as his heart is still b___________..
84. The weather in this country d_________（不同于）from place to place.
85. The two words “vocation” and “vacation” often c___________（使困惑）me.
86. How is the word “mutton”____________________(发音)
87. The new factory is expected to c___________ more chances for people to be employed.
88.It’s a pity that numbers of people lack the sense of protecting the r _________of the Great Wall.
89.It’s good to be back in __________ (文明)after living in a tent in the remote area for two weeks.
90.New York is a big c_________ city..