1 . Increased muscle _______ help support better posture and even improve daily activities like walking upstairs or carrying heavy things. (根据句意填空)

2 . At the end of a workout spend time cooling down with some slow ________ (拉伸) . （根据汉语提示拼写单词）

3 . Directions: Write down the derivatives of the given words as required.
1. permission: _______________ (n.) 许可证
2. hesitate:   _______________ (adj.) 犹豫不决的
3. economic:   _______________ (n.) 经济学家
4. innovation:   _______________ (adv.) 创新地
5. perceive:   _______________ (n.) 察觉，注意
6. replace:   _______________ (n.) 替代，更换
7. vary:   _______________ (adv.) 始终如一地，一贯地
8. calculate:   _______________ (n.) 计算器
9. application:   _______________ (v.) 应用
10. normal:   _______________ (adj.) 不正常地
11. custom:   _______________ (adj.) 习俗的，习惯的
12. accurate:   _______________ (n.) 错误，不精确

4 . One of the popular ways people now enjoy their leisure time is to do y_________. (a system of exercises for your body and for controlling our breathing, used by people who want to become fitter or to relax) (根据英文提示单词拼写)

5 . Surely this extra time would relieve the t_________ pressure which we live. (very great) (根据英文提示单词拼写)

6 . The latest equipment includes custom-made navigation tools and night v_________ system. (the ability to see; the area that you can see from a particular position) (根据英文提示单词拼写)

7 . Although it is n_________ for you to want only the best for yourselves, that is the source of your problems and stress. (typical, usual or ordinary; what you would expect) (根据英文提示单词拼写)

8 . In China, many students feel less s_________ because of the double reduction policy. (to become or make sb. become too anxious or tired to be able to relax) (根据英文提示单词拼写)

9 . Just standing still may make you feel all hot and s_________ during hot summer. (covered or damp with sweat) (根据英文提示单词拼写)

10 . These days students have more l_________ to enjoy extracurricular activities. (time that is spent doing what you enjoy when you are not working or studying) (根据英文提示单词拼写)