Which five letter word can be added at the end of below word to form a
valid word?

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What two things can you never eat for breakfast?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

What is always in front of you but can’t be seen?

People put me on the table and cut me but do not eat me. What am I?

I have eight fingers and two thumbs but I do not live. What Am I?

What goes up but never comes down?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

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