单词拼写（共10小题；每小题1分，满分10分）
根据下列句子所给汉语意思或单词首字母，写出空缺处各单词的正确形式。(将单词写在答案页本题的横线上)
71. The headmaster wants to have the opening speech d______by our English teacher next month. (原创)
Dr Yuan searched for a way to increase rice harvests without ____(扩大)the area of the fields. (原创)
73. The problem is so ___________ （令人迷惑）that few people can work it out.
74．There is a general _________(信念) that things will soon get better.
75．The boy lifted the stone with all his _______(力量).
76. Many of the young ____________(一代) enjoy foreign music and films.
77. I know you don`t like her but try not to make it so _________(明显)
78. A recent survey showed that 53.3 percent of China's middle-class people were not s________(满意) with their physical and mental conditions. (原创)
79. World Expos have excited and___________(鼓舞) more and more people in the world. (原创)
80. By r_______(减少)excess emissions(过度排放) of greenhouse gases, we can put the low-carbon lifestyle into practice gradually. (原创)