There is probably no limit to what science can do in the way of increasing positive ex cellence.
In these ways those who preach "nature" are inconsistent, and one is tempted to regard them as mere conservatives.

A．how to teach the students to swim well
B．how to make the students more active in their learning
C．to complete "the relationship-building" ahead of time
D．to urge the teachers to go to the office more often

A．intelligent
B．impressive
C．influential
D．incentive