英语非谓语的几个小问题

英语非谓语的几个小问题
有几道题目答案和我做的有点出入
希望大家给我个回答 以及为什么
共3个问题
He decided to telephone rather than ______(write)我的答案 to write
标准答案:write
Why don't you ger your wife_____(explain)it to you.我的答案 explain
标准答案: to explain
He knows better than _______(do) such a silly thing.我的答案: do
标准答案: to do
谢谢 请详细点