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No other drugs are as good as this one; it must have been based on a(n) ________ formula (配方).
A. enormous
B. stimulating
C. unique
D. overwhelming
Mothers tend to be too ________ toward their children. They should let them see more of the world.
A. hopeful
B. protective
C. modest
D. encouraging
Showing some sense of humor can be a(n) ________ way to deal with some stressful situations.
A. genuine
B. available
C. effective
D. favorite
He suggested transporting the supplies by air. But it is absolutely ________, for it will cost too much.
A. unusual
B. uncertain
C. impractical
D. impressive