单项选择题
A．To take prompt and effective actions. B．To supervise the construction of schools. C．To provide water and power supply. D．To prevent instability and aggression.
A．enjoyed the sound of the mechanical piano B．preferred quietness to noise C．was going back to his hometown D．wanted to be friend the Davidsons
A．have long-term planning B．can manage your time well C．are lucky enough to have new opportunities D．can solve both company and family problems