Exploringspaceisexciting,yetda

Exploring ________space is exciting, yet dangerous. There is ________need for both robots and humans for space exploration.

A．the; a

B．a; a

C．/; a

D．/; the

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A．aims

B．aiming

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A．coincidence

B．accident

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A．a ; the

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A．I have feet of clay	B．there is no smoke without fire
C．the world is my oyster	D．I have butterflies in my stomach

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A．would have arrived	B．had arrived
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