I don’t know the ______ (原始的) meaning of the word, but I know how to use it, anyway.
The goods are o__________, but you can choose only one.
Only with a v__________ passport can we go abroad.
The topic of argument is __________.
The plot of this science fiction story is __________ (难以置信的).
The little daughter has an __________ (想象的) friend, which is hard to believe for adults.