二. 介词填空: （按课本课文内容填入适当的介词）
11. Successful language learners are learners _____ a purpose.
12. Successful language learners are independent learners. They do not depend _____ the book or the teacher.
13. It is just like a 24-hour library, which enables us to search ____ the right information we need by simply typing in some key words.
14. It is necessary for them to learn the language in order to communicate ____ these people and to learn from them.
15. ____ the other hand, if your language learning has been less than successful, you might do well to try some of the techniques outlined above.

1.with (with a purpose)
2.on (depend on)
3.for(search for)
4.with(communicate with)
5.on(on the other hand)

皆为固定搭配