—What you've said sounds __________, but can we really solve the problem in that way?—It is worth a try.
Greatly moved by her words, __________.
The population of many Alaskan cities has ______ doubled in the past three years.
---In the past ten years, there have been many changes in family life. --- Are these changes ______?
His sister had become a teacher , ______ was what he wanted to be.
They ______ on the program for almost one week before I joined them, but still no good results _______ so far.