依次填入下列各句横线处的词语，最恰当的一组是（    ）
①美国世界级网球名将桑普斯在ATP总决赛冠军争夺战中，以3比0轻松击败他的老对手阿加西，又一次夺得冠军，这是他第五次_  ____ATP。
②春节期间，北京不少大中型商厦为促销贴出这样的布告：凡在本店购货满300元者，本店将_   __一份精美的礼品。
③杭州大酒店越来越多，一流厨师供不应求，于是不少店家争相出高价招聘，有人戏称：“酒店挖__  ___,肥了大厨师”。

酸、碱、盐在水溶液中发生的复分解反应，实质上就是两种电解质在溶液中____ 的反应，这类离子反应发生的条件是____ 、____ 、或____ ．

阅读短文，从方框中选择适当的单词填空。

    The London Olympic Games is still a few months away. But in the US, kids had ____  in a mini-Olympics competition.
Michelle Obama（米歇尔.奥巴马）, the First Lady of the US, held the games. Children played basketball ____  four-time gold medalist(金牌得主) Lisa Leslie. They ____  played soccer and tennis with famous players. The ____  of the competition was to teach kids the Olympic spirit(精神).  “The most important thing is not to win, ____  to take part.” The First Lady said. How meaningful it is!