关于动名词作主语，谓语动词使用is还是are的问题？？

Question

1、understanding the book and remembering it （ ）very important to you与 2、Eating Dangshen herb and drinking lots of water ( ) also good for this。

Answer 1

当作主语的动名词只有一个时，谓语动词用单数。例：Swimming is good for our health.
当做主语的动名词有两个或更多时，谓语动词用复数。例：Running and jumping are my favourite.

Answer 2

is和are都可以

Answer 3

同意gugi006的说法