His _____of the aeroplane was correct in every detail and could really fly.

I haven’t started writing my novel yet—I am still waiting for ______.

—Mary was being badly treated when John happened to pass by and helped her out.—I think it was not a pure ________but had been well planned.

Computers are of great        to the development of science and technology.

Seeing the happy ______ of children playing in the park, I’m full of joy and confidence in the future of our travel agency.