Time should be made good use of ____ our lessons well.
My grandmother had________ over 50, 000 when she was sixty- five years old.
— Whom shall I give the document? — To ________ is in the office. However, _______to require a written paper for it.
In the face of ________ failure, it is the most important to keep up ________ good state of mind.
The _______ boy was last seen _______ near the East Lake.
Though I have often heard this song ______, I have never heard you ______ it.