【C9】A．obtainB．gainC．retainD．maintain

A．fountainB．obtainC．containD．maintain

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A．executeB．interpretC．compileD．maintain

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Cooling makes the engine metals their mechanical properties.A.RemainB.to remainC.retainD.t

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【C9】A．exhaustB．gainC．loseD．economize

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The pillars ____ the roof of the house.A.preserveB.reserveC.retainD.sustain

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Women have yet to ____ full equality with men in the workplace.A、obtainB、acquireC、 achie

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【C4】A．keepB．maintainC．retainD．protect

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