根据对话内容,用方框中所给单词的适当形式填空,每词限用一次。Bill: I saw a great programme on TV about space yesterday evening.
Tony: What is {#blank#}1{#/blank#} about?
Bill: Scientists have discovered {#blank#}2{#/blank#} on Mars.
Tony: Really? That's very fantastic. Have they discovered life on Mars?
Bill: Well, they're looking{#blank#}3{#/blank#} life but they haven't found anything yet.
Tony: I know there's {#blank#}4{#/blank#} life on the moon.
Bill: Yes, that's right. So far there's only life on {#blank#}5{#/blank#} .
Tony: Are we alone with so many stars in the universe?
Bill: I am interested in it, so I want to be a scientist when I grow up.
Tony: I wish you will.