1 . She has not eaten breakfast for the last few months and she has had trouble c______ in class. (根据首字母单词拼写)

2 . _________ (专心于) on my homework, I didn’t notice they had sat down behind me. (根据汉语提示单词拼写)

3 . You should ______(专注于，集中注意力于) on what you want to do in your daily life. (根据汉语提示单词拼写)

4 . I was unable to c______ on my studies with the noise going on outside. (根据首字母单词拼写)

6 . With his attention ________ (concentrate) on the shops along the road, he knocked an old man down. (所给词的适当形式填空)

7 . I decided to ________ (集中) all my efforts on finding somewhere to live. (根据汉语提示单词拼写)

8 . It’s too noisy outside to ________ (专心) on my study. （根据汉语提示单词拼写）

9 . I couldn’t __________(集中精力) on the experiment because it was noisy outside. (根据汉语提示拼写单词)

10 . My parents often remind me to __________(集中) all my efforts on my study. (根据汉语提示单词拼写)