A salesman’s [cardinal] rule is to satisfy custom

Customs refer to short－established social rules that are considered acceptable or nor

If customers are satisfied, there is a chance that they will be retained for a long time and possibly permanently.（)

Young ______ he is, he has proved to be an able salesman.A．thatB．whoC．asD．which

According to the passage, a good salesman is one who ______.A．treats his customers sharply

The first rule of camping is to keep a clean camp site, so let’s tidy______ up.A: itB:

The first rule of camping is to keep a clean camp site, so let’s tidy ______ up.A: th