A.cleaning up | B.being cleaned up | C.to clean up | D.clean up |
A.often | B.by accident | C.once in a while | D.all of a sudden |
A.progressed | B.operated | C.equipped | D.managed |
A.come on | B.turned out | C.come along | D.turned up |
A.checked | B.examined | C.tested | D.measured |
A.accept | B.cooperate | C.approach | D.demand |
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