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.
1._______ 2._______ 3._______ 4._______ 5._______
6._______ 7._______ 8._______ 9._______ 10._______