A．Obedience training would teach the dog to perform clever tricks.
B．Obedience training would be the foundation for solving any behavior problem.
C．Obedience training would solve all behavior problems of the dog.
D．Obedience training would enable the dog to gain its food.

A．He is only good at cultural affairs.
B．He is quite competent in his work.
C．He is too ambitious.
D．He needs further guidance from others.