There are some seemingly insignificant matters that, when _______ in time, can become bigger ones later on.
— 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.
The country itself didn’t have enough gas because of the war, so the government decided to ________ its gas supplies to other countries.