12.Alice is kind, careful, energetic and has much experience of looking after children. In a word, she is very_______.
Carl Linnaeus made great contributions to ________ plant species.
He observed a stranger _______ around the store at 12 p.m. last night.
Once ______ , the plan can’t be changed.
They asked me so many ______ questions that I got ______.
Jumping out of ______ airplane at ten thousand feet is quit ____ exciting experience.