I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What has one letter and starts with an E?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

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.

I’m tall when I’m young, and I’m short when I’m old. 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.

O_er_t_o_

Complete the missing letters of the given word.

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Which Burger Is Different in below image?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?