1 . 对不起，我一定是拨错电话号码了。 (must have ...) （汉译英）

2 . The letters were also beautifully illustrated – each ________ its true author, Tolkien, a long time to complete.
信里还配有精美的插图——它们真正的作者托尔金一定花了很长时间去完成每一幅画作。