【C9】A．obtainB．gainC．retainD．maintain

A．fountainB．obtainC．containD．maintain

A．executeB．interpretC．compileD．maintain

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

【C9】A．exhaustB．gainC．loseD．economize

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

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