53._________A.. onB. inC. atD. about

What he said just now had little to do with the question ______ discussion.A．onB．inC．under

Four years of service entitle Jack ______ a pension.A．onB．inC．atD．to

She was______her wits end and could do nothing more.A．onB．inC．atD．with

The young man is swift _____ anger.A. toB. inC. atD. off

Kunming is _____the southwest of China.A. onB. inC. to

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