I wonder why Jenny___to us recently.We should have heard from her by now
These plastic flowers look so _____ that many people think they are real.
When the big bills for mother's hospital care came, father was glad he had money in the bank to _____.
The farmers were more anxious for rain than the people in the city because they had more _____.
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.