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

What word begins and ends with an E, but has only one letter?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. 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.

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

Which point will the car reach to go out?

What breaks yet never falls, and what falls yet never breaks?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What has many keys but can’t open a single lock?

If six children and two dogs were under an umbrella, how come none of them got wet?