A．Carry out more research on it.
B．Plan well in advance.
C．Cut down energy consumption.
D．Adopt new technology.

A．When luck plays a role.
B．What determines success.
C．Whether practice makes perfect.
D．How important natural talent is.

A．It knocks at your door only once in a while.
B．It is something that no one can possibly create.
C．It comes naturally out of one’s self-confidence.
D．It means being good at seizing opportunities.