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?

O_er_t_o_

Complete the missing letters of the given word.

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

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?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?