Young as he is, David has gained ______ rich experience in ______ society.

A:the the B:a / C:/ / D:/ the

Young as he is, David has gained （　） rich experience in （　） society.

A:the the B:a / C:/ / D:/ the

He gained his ______ by printing ______ of famous writers.

A:wealth; work B:wealthy; works C:wealthy; work D:wealth; works

The truck gained momentum as it rolled down the steep road.

A:motive B:energy C:force D:dilemma

Young as he is, David has gained ______ rich experience in ______ society.

A:the the B:a / C:/ / D:/ the

Young as he is, David has gained （　） rich experience in （　） society.

A:the the B:a / C:/ / D:/ the

The heat gained per pound of refrigerant in the evaporator is known as the _____.

A:latent heat of vaporization B:sensible heat C:refrigerating effect D:specific heat of vaporization