S5. One should not only generate far-fetched ideas but also ________ because the latter step is the nearest to reality.

A．Because many young people have moved into comfortable apartments.
B．Because many old houses in the bad part of the town are not inhabited.
C．Because many older people sell their houses after their children leave.
D．Because many people have quitted their old houses to build new ones.

A．He should show respect for the interviewer.
B．He should show confidence in himself.
C．He should talk enthusiastically.
D．He should be dressed properly.