However, where immediate action is necessary to ensure safety of the ship, its machinery and crew, it must be taken by the engineer in chargeWhat dose “it” mean in the sentence above？

I’m sorry I can’t see you immediately？

I came here immediately after having my supper.（英译中)

During an engine room watch if immediate action is necessary to ensure safety of the ship

There are many animals, however, ____ never play.A: whatB: whichC: thatD: where

The old couple decided to move out of town to a quiet （) , where they had spent several years immediately after their marriage.

I felt ashamed of myself and my action when I saw