Joan is a nice girl. One day when she was taking a walk in the park, she saw a bird lying on the grass. Joan found that there was something wrong with its wing(翅膀) and it counldn't fly. She ran to the bird and{#blank#}1{#/blank#}  it up. Joan took it home. She looked after the bird very carefully. Soon the bird got better. Joan let the bird{#blank#}2{#/blank#} away.
   Now, the bird often {#blank#}3{#/blank#} to Joan's window. Each time the bird {#blank#}4{#/blank#} some food by Joan. It seems that the bird enjoys visiting Joan. For Joan, the bird{#blank#}5{#/blank#} her friend since she brought it home.

     draw, dollar, sell, common, safe

A: Mona, what are your predictions about future?

B: The future? Well, I think we needn't work outside. Even there's no {#blank#}1{#/blank#}for us to do.

A: No work? Who will do the work?

B: Robots will do all the work for us. Don't you think so?

A: How about teachers? Won't there be{#blank#}2{#/blank#}teachers?

B: No teachers. We will study on computers at home.

A: No work. No teachers. What will we do?

B: We can relax and play sports to keep {#blank#}3{#/blank#}.

A: What will our parents do then?

B: Our parents will take long vacations to enjoy their lives.

A: Vacations? Where will everyone go?

B: Somewhere quiet and {#blank#}4{#/blank#}, or to the sea, or to the moon!

A: Why don't we take vacations on the earth?

B: There will be too many people and too much {#blank#}5{#/blank#}on the earth. We even have no place to live in.

A: I think that's interesting, but unbelievable.