填空，概括文章的主要内容 Public speeches are speeches delivered in public for    1     . There are different kinds of speeches, such as impromptu speeches, extemporaneous speeches, speeches from reciting, speeches from    2    , etc. In order to arouse the interest of the audience and to obtain their support,    3     or consent, the speaker will have to appear to be    4      to the audience and use    5      to make his speech persuasive, engaging and    6     . Public speeches are strongly influenced by the     7     of the written language. Generally speaking, the language used in public speeches is formal in    8     , clear and vivid in    9     , and persuasive in    10     .