Curiosity is not only a possible motivation，it is also a great help in your learning languages. Remember that a language is not (11)______ a grammatical system. It is the (12)______ of a certain culture of different cultures. It is no good (13)______ strings of words and lists of grammatical rules (14)______ you know as much as possible about the background of the language，so that you can understand the ideas conveyed and the references made，as well as the inferences which can (15)______ the information clearly given. so learn as much as you can about the different cultures which (16)______ English-watch television programs，listen to the radio，try to obtain (17)______ and magazines written by native speakers，look at advertisements，and，above all，read-not textbooks， (18)______ novels，poems and plays. They will show you how a language is (19)______ used. The English language is a living form. of expression which derives much of its (20)______ from the context. and much of its effect from a whole network of extra-linguistic knowledge.
(11)

A. just
B. even
C. so
D. that