Yes
Use the prefix of Mrs. if it is a fomal letter. If not, and you are familiar with them, use their first name.
The friendly letter has a proper heading. Use the salutation, Dear, followed by the first name of the person you are addressing.
Assuming a business letter to husband and wife with different last names who you don't know the proper business salutation is to have the the wife's name first before the husband's accompanied by the proper titles. For example: Dear Mrs. Thompson and Mr. Jones, (salutation on letter) Mrs. Susan Thompson and Mr. Jeremy Jones (address on envelope and letter) Note that you could use "Ms." instead of "Mrs." if you prefer, although I recommend that since in this example you know they are married I would choose "Mrs." Jim Lumley jimlumley@live.com
Mevrouw
'Buddhism' is a proper noun, so we always use a capital letter.
Mrs Robert Smith is appropriate, but more so would be to use her first name, such as: Mrs. Julia McGillicutty
"Dear" is what people use it nowadays.
is is correct to use Dr. Mrs. for a female doctor?
Use the name of the person who wrote the letter, and write a formal letter. Use the salutation "Dear Mr. ____" or "Dear Mrs. _____" as a salutation.
to make sure every thing is different like in a letter you have the heading body paragraphs and then the closing.
you should use correct ones
The teacher told us to write our heading on the paper