What does this rebus puzzle means ?

Using eight eights and addition only, can you make 1000?

Which is the correct shadow of the bird?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

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

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?

Why do we preferably have round manhole covers and not square ones?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

What time is it when an elephant sits on a fence?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?