I wish to express my thanks for being warmly received when I was visiting your firm.

A．many different games with balls
B．many different kinds of games
C．only one ball game
D．different games with similar rules

A．There are only a few continuing education classes available for adults.
B．Only those who want to get more money should go on with their education.
C．People take continuing education classes for different reasons.
D．All the people getting continuing education can get a good job.