Can you write down eight eights so that they add up to one thousand?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

I know a nine-letter word having only one vowel.
Do you ?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

If you say my name, I will no longer exist. What am I?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?