1. (2020·天台模拟) 用方框中所给单词的适当形式填空，每词仅用一次。

twelve  cancel  until  warm  medicine

1. （1） It's good manner to treat others with kindness and .
3. （2） December, the month of a year, is my favorite month.
5. （3） I didn't realize the importance of teamwork I made the soccer team.
7. （4） It's sad that we have to the sports meeting because of COVID-19 (新型冠状病毒).
9. （5） To save people's lives, the doctors are risking their lives to do research.