并列动名词的主谓一致关系

书上说，动名词做主语，坐落于动词用单数形式。那样若是并列的动名词做主语，应该视为单数还是复数？如：
Swimming and running are / is good.
Eating vegetibles and fruit are / is good.
请专家老师解惑。

单个动名词做主语，谓语动词用单数形式。若是并列的动名词做主语，应该视为复数。如：
Swimming and running are good.
Eating vegetibles and fruit is good.
以下是龚亚夫主编的《新编高中英语语法》普及版 p.254上的例句：
Finding a job is difficult these days. 目前找工作困难。
Listening, speaking, reading and writing are the important things you must do in learning a foreign language. 听、说、读、写是学习一门外语时需要做到的几件要紧的事情。