n environment can help the city bid for the Olympics, which____ will promote its economic development

If they had known what was coming next, they_____ their mind.[ ]

He didn’t make ________ preparations, or he would have succeeded in the job interview.

It was reported that the government and thetroops__________the victims of the earthquake stricken areas in Qinghaiprovince

Coughing _____ C．must D．need