What is so fragile that saying its name breaks it?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

What has one letter and starts with an E?

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

James ordered a fishing rod, priced at $3.56. Unfortunately, James is an Eskimo who lives in a very remote part of Greenland and the import rules forbid any package longer than 4 feet to be imported. The fishing rod was 4 feet and 1 inch, just a little too long, so how can the fishing rod be mailed to James without breaking the rules? Ideally James would like the fishing rod to arrive in one piece!

Can you decipher the below rebus?

PBLUESAISNUERSES

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?