TheChinese government has made great efforts to______thegapbetween the rich and the poor, but has not achieved obvious results

The two old friends were ____ busy ____ with each other that they forgot the time.—Yes. They hadn’t met for over ten years, so they kept talking the whole night.

Is there ____ European wolf in _____ zoo

The meeting was concerned ____ reforms and everyone present was concerned ____ their own interests[ ]

ys, sending e-mails to each other hasbecome a way ______________ what they think to others