1.步行有益健康。

Walking  {#blank#}1{#/blank#} your health.

2.汤姆这些天在忙着准备期末考试。

Tom is{#blank#}2{#/blank#} his end-of-term exams these days.

3.幸亏你的帮助，我才按时完成了工作。

{#blank#}3{#/blank#} your help, I finished my work on time.

4.我们的新操场是去年建成的。

 {#blank#}4{#/blank#}

This is{#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} my family．

Helen works hard {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}. I think she should have a good rest.

I {#blank#}1{#/blank#} {#blank#}2{#/blank#} the lost keys.