1.（）is known to us all that Tom wants to visit ( ) they call

1.（）is known to us all that Tom wants to visit ( ) they call the paradise someday if he can afford it.
It ； what
2.We're just trying to reach a point ( ) both sides will sit down together and talk .
where
3.I've made not a single mistake this time .
( ) .
you should never be too careful .

第一题中It is known to us all that .为固定句型,意为“.是众所周知的”.其中It为形式主语,that从句为真正主语.call 后可跟双宾语,what 在这里做它的直接宾语.全句意为“众所周知,有朝一日,如果汤姆支付得起,他想要去他们称之为天堂的地方去旅游”.
第二题中 where 引导了一定语从句,先行词point 在这里为一表示抽象地点的名词.全句意为“我们现在已到了一个双方要坐下来谈判协商的这么一个阶段”.
第三题中you should /can never be too + 形容词意为“你怎么.都不为过”,为固定句型.