It's said that America receives tens of thousands of inventions every year. Of these only a few become {#blank#}1{#/blank#} (受欢迎的)and make a lot of money. There are thousands of inventions that {#blank#}2{#/blank#} (没有人) wants. Here are some of these.

    In 1879, somebody invented a new type of "fire escape ". This was a hat which had a parachute(降落伞) on top. You {#blank#}3{#/blank#} (连接) the hat with a strap under your chin. With this special hat on you could jump from a building on {#blank#}4{#/blank#} (火) and fly down safely. With it there was also a special {#blank#}5{#/blank#} (双) of shoes, so the person could land safely.

    There was a special alarm clock for people who had {#blank#}6{#/blank#} (问题) waking up in the morning. This clock had six pieces of wood that hung above your head. At the right time the pieces of wood {#blank#}7{#/blank#} (掉落) on you when you were sleeping. They hit you but did not {#blank#}8{#/blank#} (伤害) you, Therefore, you woke up.

    Another invention was the bicycle seat to stop a thief. This seat had needles in it. When the {#blank#}9{#/blank#} (拥有者) rode the bicycle the needles were down. But when the bicycle was not in use, the needles were up. So a thief who jumped on the bike got a big {#blank#}10{#/blank#} (惊喜).