改错：下面每题中有一处错误,请改正并将正确的句子写出来

They warned us not 【加 to 】eat that red fish.
Jim is very proud with 【be proud of 以 .为 豪】his model plane.
The robber hit Tom on【的确是加 the】 head heavily.
另外 之前错了一题
9.I know my maths is poor; I wasn't 【sad 】 to see the result this time.