如图所示，将矩形纸片先沿虚线AB按箭头方向向右对折，接着对折后的纸片沿虚线CD向下对折，然后剪下一个小三角形，再将纸片打开，则打开后的展开图是
_____ are you reading in the classroom?
Shall we go to the park _____ to the zoo?
We cannot live _____ air.
_____ computer is it? May I _____ it?
I saw _____ boy walking across _____ street today.
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