It is believed that human biological systems are constantly in an interaction of ever changing contending forces of both Yin and Yang, so the goal of treatment is to restore Yang and restrain Yin.

This is the best film I __________. A: ever saw B: ever see C: was ever seen D: have ever seen

The prince and princess got married and lived happily ________. A: ever more B: as ever C: ever after D: for ever

—Have you ______been to the USA —No, I've ______been there. A: ever; never B: never; ever C: ever; ever

since之前加ever，除了强调没有其他意思。常见的表达有：ever since,ever befor,ever after, ever afterwards等。

Today family in the United States ______. A: isn't changing at all B: is changing even faster C: is changing a little D: is still very large

Backing means the wind ___ . A: is changing clockwise in direction B: is changing anticlockwise in direction C: is changing cyclonically or variably in direction D: emains unchanged in direction at the time

Neither of my parents remembered ______ the man before. A: have ever seen B: to have ever seen C: having ever seen D: to ever see

When we describe the cliffs ,we can use the word as ___________.( ) A: crystal clear B: ever-changing C: beautiful D: cragged

The Changing of the Guard .