—（）do you visit your grandparents before
—Every winter.

单项选择题In the Mediterranean seaweed is so abundant and so easily harvested that it is never（）of great.

A．fare
B．payment
C．worth
D．expense

单项选择题The new librarian still doesn't know（）the out of date newspapers and magazines.

A．what to deal with
B．how to deal with
C．how to do with
D．what to do away with

单项选择题Let's learn to use the problem we are facing（）a stepping-stone to future success.

A. to
B. for
C. as
D. by

单项选择题The lawyer listened with full attention，（）to miss any point.

A. not trying
B. trying not
C. to try not
D. not to try

单项选择题教学原则反映了( )。