It is well-known to us all that knowledge is ____ treasure, but practice is ____ key to it. A a, ∕ B a, the C the, the D∕ , the
The professor came into the classroom, ____.
Mary decided to marry ___ the man she ___.
The Emperor could not do anything, but ___ praise for the cloth.
My Chinese teacher ___ highly of my handwriting.
The grammar book she ___ was not in the library.