During the first half of the twentieth century, the average American household was () by the introduction of a group of machines that profoundly altered the daily lives of housewives.

A. Sensitive.
B. Cool.
C. Quick-minded.
D. Warm-hearted.

A. nobody notices you
B. the assistant greets you in a friendly way
C. you feel as if you were in a music shop
D. you find yourself satisfied with browsing