close的副词形式是什么

　　The two subjects are closely connected.

　　这两门学科紧密相连。

　　Those two processes are very closely interlinked.

　　那两种工艺非常紧密地互相关联。

　　Their political careers had become closely intertwined.

　　他们的政治生涯已经紧密地结合在一起了。