It says that bats (蝙蝠) are almost blind (瞎的). Do you know h{#blank#}1{#/blank#}   the bat finds the way? In fact (事实上), bats find their ways w{#blank#}2{#/blank#}  the help of their ears. Bats make a sound that we can't h{#blank#}3{#/blank#}  at all. They cry when they fly and the echoes (回声) of these cries come back to their ears. In this way they can k{#blank#}4{#/blank#}    where they should go. Bats f{#blank#}5{#/blank#}  out in the evening. In the daytime, they just stay together in their homes.

      When the evening c{#blank#}6{#/blank#}   , they begin to go out and look for f{#blank#}7{#/blank#}  . The next morning, they come back from work to sleep until the evening. Some people t{#blank#}8{#/blank#}  that bats are bad animals. In fact, they are very u{#blank#}9{#/blank#} .  They c{#blank#}10{#/blank#}  and eat pests (害虫). This is very good for people.