读短文，用所给动词的适当形式填空。
When you send a postcard, you have to 1_____ (put) stamps on the envelope or on the card. When did
people first begin 2_____ (use) stamps? Who was the first 3_____ (think) of this idea? In the early century,
people 4_____ (not use) stamps. They had to pay postage whenthey received it. Rowland Hill was a school
teacher in England. He was the first to think of 5_____ (use) stamps in the 1850s. He thought it would be
easier for people to use the stamps. Now we know

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