根据句意和汉语提示，填写单词。
1. Many people die of _________(癌症) every year.
2. I only eat food that _________(尝起来) good.
3. The library has _________(增加) its collection of books to one million.
4. The students will have an experiment in the _________(实验室) tomorrow.
5. His _________(主要的) reason for learning English is to get a better job.
