what does this picture(rebus) riddle means ?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

I cannot talk, but I always reply when spoken to. What am I?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

What does this rebus puzzle means ?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Replace the question mark with the correct number.

I have an eye but still cannot see.

Who am I?