What does this rebus riddle means ?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Can you find the key in the picture below?

I taste better than I can smell. Who am I?

What question can you never answer yes to?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

What goes through cities and fields, but never moves?

what one word does the below rebus identifies?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?