it is nacessary that he (take)_some more money with him if he wants to visit more places.
是动词时态填空吧。
应该是：
it is nacessary that he _take_some more money with him if he wants to visit more places.
意思是：
如果他想要参观更多地方，随身携带更多（足够）的现金是必要的。
理由：
英语常见问题解答大词典》(赵振才主编)等语法专著在介绍虚拟语气时都提到了下面的这个用法：在It is
imperative(essential，necessary，appropnate，desirable，important，vital...等)+that引导的主语从句中谓语动词应该用虚拟语气的形式，即使用动词原形或should+动词原形。例如：
1.It is
vitally important that they receive allthe help
available.极为重要的是他们要得到所有可能得到的帮助。(《麦克米伦高阶英汉双解词典》)
2.It is important that
you (should) keep your promise.你应该遵守诺言，这一点很重要。(《外研社·建宏英汉多功能词典》)
3.The
president said it was imperative that the release of all hostag be
secured.总统说当前要务是确保所有人质都获释。(《剑桥高阶英汉双解词典》)
4.It is essential that our prices
remain
competitive.我们保持价格方面的竞争优势是至关重要的。(《剑桥高阶英’汉双解词典》)
5.It is most desirable that they
should both come.他们两个人都来，这最好不过了。(《牛津高阶英汉双解词典》)
6.Il is desirable that you
should have some familiarity with
computers.你应该对计算机知识有所熟悉，这是很有益处的。(《朗文当代高级英语辞典》)
7.It is
advisable that they go with a clearly defined goal in
mind.他们去时宜在思想上有一个明确的目标。(《译文·英汉大词典》)
8.It is appropriate that the exhibition
should besponsored by BMW.这个展览会由BMW来主办是恰当的。(《外教社·柯林斯英汉双解学习词典》)