It was not until dark _______ he found _______ he thought was the correct way to solve the problem.
As is known to all language learners, the newly learnt words will soon be forgotten unless______ used in everyday communication.
The money collected should be made good use __________ the people who suffered a lot in this terrible earthquake.
Between the two generations, it is often their different views of life and value _______ cause family conflicts.
_________ a certain doubt among the people as to the practical value of the project.
The hours ________ the children spend in their one way relationship with television people undoubtedly affect their relationships with real-life people.