【推荐1】Hospital patients who see tree ________(branch) out of their windows are likely to recover at a faster rate than patients who see buildings or the sky instead. （所给词的适当形式填空）

【推荐1】We need to find a ________(replace)for Sue. （所给词的适当形式填空）

【推荐2】In the middle of the passage, the author explained his findings by making a_____(compare). (所给词的适当形式填空)

【推荐3】The man was ________his knife with a________ when I entered the room. (sharp) (所给词的适当形式填空)