题目内容：

单词拼写（共1小题）

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

Many inventions have helped improved our day-to-day lives and are well remembered, for example, Alexander Graham Bell for the telephone and Thomas Alva Edison for the light bulb.

However, many other inventors’ names have been forgotten 1.______ their outstanding accomplishments．For example, who was Ezra J.Warner? Back in 1858, he was the first person 2.______ (get)a patent for a can opener．Although it was effective, it was also dangerous to use and didn’t make it into households until 1870, 3.______ William Lyman introduced an effective but much 4._____ (safe) model．For another inventor, Suan Hibbard, her invention didn’t transform the world, but if did make 5._____ difference for other women inventions．She took old turkey feathers and bound6.______ together to make the first feather duster．When she went to patent it in 1876, however, she had to battle in court to prove it was her idea．Eventually, Hibbard won the patent for her invention．Her fight helped other women gain 7.____(confident) in their ideas, and their right to patent them．Alice H．Parker patented a furnace(暖气炉)that could heat individual rooms of a building at different temperatures．Both energy and money8.______ (save) by Parker’s furnace, since the invention allowed people to heat only the room needed at a(n) 9.____ (give)time．These inventors may not have received worldwide fame for their achievement, but their creations 10.______ (certain) improved the lives of many people.