1 . When you c_____on one task, you can get it faster and better. （根据首字母单词拼写）

2 . Many teenagers have difficulty c____ on their homework. (根据首字母单词拼写)

3 . 1 can't   _____（集中注意力）on my study with all that noise going on. （根据汉语提示填空）

4 . After the fun he has had during the National holiday, the boy can’t ___________(集中注意力) on his school work now. (根据汉语意思填空)

5 . 将单词与释义进行匹配，选项中有两项为多余选项。

A. essential 　　　　　B. potential　　　　　 C. concentrate D. hardship 　　　　　E. convenient 　　　　 F. obtain

1. (something that causes) difficult or unpleasant conditions of life, or an example of this. _______
2. direct your attention or your efforts towards a particular activity, subject, or problem. _______
3. possible when the necessary conditions exist. _______
4. extremely important and necessary. _______
5. to get something or achieve something. _______
6. suitable for your purposes and needs and causing the least difficulty. _______