What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

It is always ahead of me yet I can never see it. What is it?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

I have teeth but i don't bite. Who Am I ?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho