Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

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

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

How can you take 2 from 5 and leave 4?

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

How many letters are in the alphabet?

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

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

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?