There was a constant stream of them going up the Hill, carrying hundreds of polite variations on _Thank you, I shall certainly come.
The next day Frodo became really anxious, and kept a constant look-out for Gandalf.
It was difficult to learn anything from him for certain, for his talk was constantly interrupted by curses and threats.
By no means all Hobbits were lettered, but those who were wrote constantly to all their friends (and a selection of their relations) who lived further off than an afternoon’s walk.
It had been planted many generations ago, and was now thick and tail, for it was constantly tended.
We have constantly heard you muttering: "Shall I ever look down into that valley again, I wonder", and things like that.
There was not as yet any sign of a path, and the trees seemed constantly to bar their way.
Moving constantly in and out of his talk was Old Man Willow, and Frodo learned now enough to content him, indeed more than enough, for it was not comfortable lore.
With perfect truth: for Bilbo was very polite to him, calling him ’Master Hamfast’, and consulting him constantly upon the growing of vegetables — in the matter of ’roots’, especially potatoes, the Gaffer was recognized as the leading authority by all in the neighbourhood (including himself).
There are no more uses of "constant" in the book.
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The history of computers is a history of constant technological advancement.