Smart Windows

Function(功能)

They can change from clear to dark and black again when people {#blank#}1{#/blank#} them.

Some Facts

●They can make the world a {#blank#}2{#/blank#} and comfortable place.

●People could {#blank#}3{#/blank#} make the windows less bright to stay cool.

●Most people spend about {#blank#}4{#/blank#} percent of their time indoors.

●They {#blank#}5{#/blank#} of smart windows could mean that more energy can be saved.

Katy Perry's Concert

Date

On {#blank#}1{#/blank#} 

About Katy Perry

A very famous {#blank#}2{#/blank#}singer. Born on October 25th.1984

The place

In {#blank#}3{#/blank#}

Time

From {#blank#}4{#/blank#}o'clock to eleven o'clock

Ticket price

299 dollars

Telephone number

{#blank#}5{#/blank#}