用所给词的适当形式填空。每词限用一次。

      not plan,  solve,  enjoy,  write,  fill,  discover 

1.Laura usually {#blank#}1{#/blank#} beautiful music to get relaxed.

2.Be careful! She   {#blank#}2{#/blank#} the cup with hot water.

3.In the future, humans  {#blank#}3{#/blank#}  more secrets of nature.

4.To our surprise, the problem {#blank#}4{#/blank#} by the expert three days ago.

5.  {#blank#}5{#/blank#} to your parents is a good way to communicate with them.

6.—Where are you going on vacation this summer?

— I {#blank#}6{#/blank#}  it yet. 

Nick: What are reading, Jill?

Jill: It's a book {#blank#}1{#/blank#}the future.

Nick: Sounds cool. So what will the future be like?

Jill: Well, cities will be more {#blank#}2{#/blank#}and polluted. There will be fewer trees and the environment will be in great danger.

Nick: That sounds bad! Will we have to move to other {#blank#}3{#/blank#}?

Jill: Maybe. But I want to live on the earth.

Nick: Me, too. Then what can we do?

Jill: We can use {#blank#}4{#/blank#} water and plant more trees. Everyone should play a part in {#blank#}5{#/blank#} the earth.