Translate and learn the following idioms and sentences. Use them in the situations of your own

1.	airmail letter	a letter sent by air mail
2.	begging letter	a letter asking for money, sent to an individual or an organization believed to be rich
3.	blackmail letter	a letter of threatening to reveal substantially true information about a person to the public, a family member, or associates unless a demand made upon the victim is met
4.	business letter	a letter dealing with business
5.	chain letter	a letter which is sent to several people who are each asked to send copies to several others, and which sometimes threatens that bad things will happen if they do not send these copies
6.	circular letter	an advertisement intended for wide distribution
7.	complaint letter	letter of complaint
8.	confirmation letter	letter of acknowledgment, letter of confirmation
9.	cover letter	a letter sent along with other documents to provide additional information
10.	dead letter	an unclaimed or undelivered letter that after a period of time is destroyed or returned to the sender by the postal service
11.	express letter	special delivery, mail that is delivered by a special carrier (for an additional charge)
12.	letter box	a private box for delivery of mail, public box for deposit of mail
13.	letter carrier	a person, especially a postal worker, who delivers mail
14.	letterhead	the heading at the top of a sheet of letter paper, usually consisting of a name and an address
15.	letter paper	paper cut to an appropriate size for writing letters; usually with matching envelopes
16.	direct mail	advertising circulars or other printed matter sent directly through the mail to prospective customers or contributors, junk mail
17.	hate mail	mail that expresses the writer's dislike or hatred (usually in offensive language), poison-pen mail
18.	snail mail	normal postal mail, where an actual physical letter or package is delivered; paper mail, as opposed to electronic
19.	love letter	a personal letter to a loved one expressing affection
20.	Dear John letter	a letter written by a woman to her husband or boyfriend to inform him that their relationship is over, usually due to the woman finding another man
21.	letter bomb	a small bomb that is put in an envelope or parcel and sent to someone by post
22.	open letter	a letter intended to be read by a lot of people, not just the person it is addressed to
23.	red-letter day	a special, happy and important day that you will always remember