You must（）yourself, or they will continue to bully you, so you will go on living in disgrace.

单项选择题We must try to（）the best of our moral values for our children and grand-children

A. replace
B. remain
C. generate
D. preserve

单项选择题In the flint decades of the twentieth century, the individual gem could not be seen, but could be worked with fruitfully（）

A. blindly
B. completely
C. productively
D. carefully