On the other hand, our language 【C10】______ a large number of words which are comparatively 【C11】______ used in ordinary conversation. Their meanings are known to every educated person, but there is little 【C12】______ to use them at home or in the marketplace. Our 【C13】______ acquaintance (熟悉) with them comes not from our mother's 【C14】______ or from the talk of our schoolmates, 【C15】______ from books that we read, lectures that we 【C16】______ , or the more 【C17】______ conversation of highly educated speakers who are discussing some particular 【C18】______ in a style. properly higher above the habitual 【C19】______ of everyday life. Such words are called "learned", and the 【C20】______ between them and the "popular" words is of great importance to a right understanding of language study process.
【C1】______
A. at
B. with
C. by
D. through
"... people who did wondering. What if?" (paragraph 3) refers to "those______".
A. who think too much of the dark side of life
B. who regret giving up their career halfway
C. who think a lot without making a decision
D. who are full of imagination even upon death