题目内容：

Valentine’s Day is the time of the year when couples show their love for each other by sending cards，flowers and chocolates. Its origins are1.________(clear) and hidden in the river of time. Nobody knows exactly 2.________St.Valentine was，although some historians suggest he was 3.______Roman killed in the third century AD by a Roman Emperor. It is said that the first4._______(record) Valentine’s card was sent by the imprisoned Duke of Orleans in 1415. 5._______is believed that he tried to find comfort from his imprisonment by writing love poems to his wife.

Now，Valentine’s Day 6._______(celebrate) in many countries around the world. However, the traditions often differ from place to place. In Japan，for example，it is normal 7._______the woman to send chocolates to the man, 8._______in South Korea April 14th is known as “Black Day” and is when the unfortunate men who received nothing on Valentine’s Day gather to eat noodles and show sympathy for each other.

Technological 9._______(develop) have also played their part 10.______ keeping Valentine’s Day relevant in the 21st century. Valentine’s e­cards have been very popular in recent years.