It is a known fact that physical activity improves overall health. Not only

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问题     It is a known fact that physical activity improves overall health.
Not only does it improve circulation, increase blood flow to the brain,
and raise endorphin levels, which both help to reduce stress, improve【S1】________
mood and attitude, and calm children, physically active students may
also achieve more academically.  Physically fit students are more likely【S2】________
to miss school, partake in risky behaviors, get pregnant, or attempt
suicide, which all associated with better outcomes in school.【S3】________
    Many studies have demonstrated the positive effects of physical
education and physical activity on school performance. Several studies
have stated that providing increased time to physical activity can lead to【S4】________
better concentration, reduced disruptive behavior and higher test scores
in reading, math and writing.
    One specific study that addressed this issue was done by Sallis
et al. when they implemented a program called Project SPARK in which【S5】_________
it provides physical activity during class by containing health-fitness【S6】________
activities like jumping rope and aerobic dance so well as sport-fitness【S7】________
activities like soccer and Frisbee games and focuses on training teachers
to implement the curriculum. The program also promotes physical
activity outside of school and rewards children in engaging in physical【S8】________
activity with their families. Results of the study show that when teachers
were trained to use Project SPARK there were significant differences
between the experimental and control groups in language, reading, and
other basic skills.  This study shows that organizing physical education【S9】________
programs can impact student performance even though in short term【S10】________
experiments. [br] 【S3】

选项

答案 ∧all—are

解析 系动词缺失。该句意为“……这些都与更好的学校表现相关联。”be associated with为固定搭配,意为“与……相关联”,因此a¨前加上are。
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