There existed an obvious________ between the accounts of the witnesses, so a judgment was not announced in court.

Nowadays many parents from the countryside cannot afford to educate their children, because the school      are too high.

The police always take ________ of dogs’ sharp sense of smell to search for the survivors in the earthquake.

—Do I need to give a tip if I eat at a fast food restaurant in the United States?—Yes , it’s a common       to tip waiters in a restaurant.

China has got a good ______for fighting against the flu with its careful and smooth organization.