在短文的空格内填入适当的词，使其内容通顺。每空格限填一词，首字母已给。
In 1947, an American pilot said that when
he was flying in the sky he had seen nine strange things. They looked like
saucers. Then n{#blank#}1{#/blank#} reported his story. After that, more people
all over the world said they had seen strange things. But people could not
decide on what the things were or w{#blank#}2{#/blank#} they came from. So they c{#blank#}3{#/blank#} them UFOs.
In 1973, two f{#blank#}4{#/blank#} said that when they were fishing by a river
they had seen a UFO. It looked like an egg. There were three f{#blank#}5{#/blank#} like men in it. They had no eyes and their
mouths were long and narrow. Their noses and ears were strange too.
p{#blank#}6{#/blank#} some people made a mistake,
but pilots and astronauts do not usually make mistakes of this kind. Captain Ed
Mitchell, the sixth man to walk on the Moon, said in 1974 that he had seen some
flying saucers. He said these flying things were perhaps visiting the Earth
from other worlds in space.
There are many stories about UFOs. However,
n{#blank#}7{#/blank#} knows whether they are true or not.
