Directions: For each numbered blank in the following passage, there are four choices marked A, B, C and D. Choose the best one and mark your answer on ANSWER SHEET with a single line through the center.
How men first learned to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain 【A1】______ to express thoughts and feelings, actions and things, 【A2】______ they could communicate with each other; and that later they agreed【A3】______ certain signs, called letters, which could be written to represent those sounds, and which could be 【A4】______. Those sounds, whether spoken, or written in letters, we call words.
The power of words, then, lies in their 【A5】______—the things they bring up before our minds. Words become 【A6】______ with meaning for us by experience;【A7】______ the longer we live, the more certain words 【A8】______ to us the happy and sad events of our past: and the more we【A9】______, the more the number of words that mean something to us 【A10】______.