1 .
用方框所给单词填空，其中有一个单词是多余的。

category     experiment     annual     found     painful     individual

1. Susan is a volunteer in the library. Her job is to place different books into different ________, which is really challenging.
2. The company was ________ by the son, who finally realized his childhood dream.
3. My shoulder feels even more ________ after an improper massage. I can hardly lift my arm now.
4. The astronauts are starting several ________ in the space to learn more about how the human body adapts to weightlessness.
5. It’s the custom of the academy to make an ________ award for those excellent scientists in Physics.