补全对话。A: Look, Mona! {#blank#}1{#/blank#}?
B: Oh, it's a computer. It is widely used in today's world.
A: You are right. Do you know {#blank#}2{#/blank#}?
B: Yes, it was invented in 1946.
A: {#blank#}3{#/blank#}?
B: It is used for helping us work, study, send e-mails and so on.
A: {#blank#}4{#/blank#}?
B: It is said that it was invented by some American scientists.
A: By the way, what are you going to be when you grow up?
B: {#blank#}5{#/blank#} and invent many useful inventions for our motherland.
A: OK. Let's work hard to make our dreams come true.
