60._________A. onB. atC. toD. by

Our clothes are low ____ price, high ____ quality.A、at ... onB、on ... atC、to ... inD、in

We have decided to call ______ Mr. Black sometime next week at his home.A．onB．atC．upD．for

He used to shout_____ me when I was a child.A.onB.atC.after

Many thousands have benefited______the new medical system.A．onB．inC．toD．from

Contrary_____ all advice, he started to climb the mountain during a storm.A．onB．atC．toD．ag

The child was knocked _____ by a passing car.A.onB.atC.inD.down