Mark the letter A, B, C or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 627 to 631.

Speech is one of the most important ways of communicating. It consists of far more than just making noises. To talk and also (627) ___________ by other people, we have to speak a language, that is, we have to use combinations of sounds that everyone agrees to stand for a particular object or idea. Communication would be impossible (628) _______________. Learning a language properly is very important. The basic vocabulary of English is not very large, and not only about 2,000 words are needed to speak it quite well. But (629) _______________, the more precise you can be about their exact meaning. Words are the main thing we use in communicating what we want to say. (630) _______________. (631) _______________ of voice can express many emotions and show whether we are pleased or angry, for instance.