Peter was disappointed to see the bike he had ________ went wrong again. A. repaired B had repaired C. repair D. to repair
It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
With the change of the economic foundation the entire immense superstructure is _____ rapidly transformed.
His landlady gave him a week's _____ to leave the flat.
Some people either _____ avoid questions of right and wrong or remain neutral about them.
If he refuses to _____ my plan, I can probably find someone more cooperative.