短文填空。（每空2分，共16分）
根据下面短文内容, 在短文的空格处填上一个恰当的词, 使短文完整、通顺。
Thomas Edison was a famous American inventor. During his lifetime he     1,093 inventions. That’s amazing, isn’t it? Many of his inventions have changed our life. You may ask    Edison was able to make so many inventions. That’s because he was the man who never  up. He always thought that no matter how  the problem seemed, he could find the answer. He believed that nothing was difficult    you put your heart into it. That is true. When he was a child, he was always asking strange questions and trying out new ideas. Many of his questions made his teachers unhappy or angry,   the strange questions were not about his lessons. He couldn’t study at school, so his mother taught   at home. He was interested    science and learned very fast.