A．He has just started to teach piano lessons.
B．He seldom takes things seriously.
C．He is very proud of his piano skills.
D．He usually understates his achievements.

A．opposites get on better than similar personalities
B．exactly the same bases for success apply for ordinary friendships
C．it is first of all necessary to limit prospective partners to people from similar backgrounds
D．the most successful are those between people who are alike but not exactly the same