根据上下文，在空白处填正确的内容，使短文意思完整语句连贯。
When you __1__ (发信) or a postcard, you have to put stamps on the envelope or on the card. When
did people first begin to use stamps? Who was the first to __2__ (想到) this idea?
In the early __3__ 十九世纪), people didn't use stamps. They had to pay postage when they
__4__ (收到) it. Sometimes they didn't want to receive a letter__5__ (根本不) but they had to pay
money for it. They were unhappy about this. The postage was high __6__ (在那时), because the post
offices had to send many people to get the postage.
Rowland Hill was a school teacher in England. He was the first to think of using stamps in the 1850s.
He thought it would be __7__ （容易得多) for people to use the stamps. They could to the post office
to buy stamps and __8__ （把它们贴在……上) the envelops before they sent the letter. The post
office could just put marks on the stamps __9__ (以便) people could not use the stamps again.
__10__ （用这种方法) the post office did not need to send postman to get postage. It only needed
fewer postman to send letters.
