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Write a letter to your friend asking him about his health
A letter should be written to your manager when you are asking for 3 days leave, not an application. The letter should include your reason for taking the time off.
Write a letter on decline in sales as you are a general manager
how do you write a letter to bank manager to know your transaction
How do you write a letter to boss asking advance for travelling
how do you write a transfer letter
To write a letter to thank the bank manager for loan sanction you have to make it official.
how to write an application to the bank manager to unblock atm card and new pin issue
It is not clear if your PhD is in English or you want to write a letter in English. If you want to write a letter in English you should ask this question: How do you write a letter in English asking for PhD supervision.
You cannot. There are many safety clearances you need. I would suggest staying in school and when you do a PhD you can order chemicals
how to write car handover to the manager from company
How do I write a audit letter about concerns on an audit