1 . When you exercise, your body produces some chemicals that make you feel peaceful and relaxed and increase your ability to c__________________ while studying

2 . How can I c________ on my work with so much noise? (根据首字母单词拼写)

3 . With his attention c_______________ on his book, he didn’t notice someone entering his room.

4 . When _____(concentrate) on/upon the task, you will finish it as quickly as you can.

5 . I tried to read a few pages, but I found it hard to c ________on reading with all that noise.（根据首字母单词拼写）

6 . She was sitting there with her attention c______ on her novel. (根据首字母单词拼写)

7 . I stayed up late last night. That's why I cannot c________ my attention on study today. (根据首字母单词拼写)

8 . When you exercise, your body produces some chemicals that make you feel peaceful and relaxed and increase your ability to c________ when you study. （根据首字母拼写）

9 . If you often skip breakfast, you will have trouble c________in class. （根据首字母单词拼写）

10 . I slept badly and had difficulty c___________________ my mind. (根据首字母单词拼写)