ToliveonMars,youneedtowearboot

To live on Mars, you need to wear boots which ________ to prevent you from floating off into space.

A．design	B．designed
C．are designing	D．are designed

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B．read; read

C．reading; reading

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B．by use

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---- Why not go to Tai Hu ? That’s a good place.

A．why I can go fishing	B．where I can go fishing
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