The old professor, to_______ the important invention _______, decided not to keep it for himself, but to make it known to all over the world.
____computers are of great benefit to the development of science and technology.
____puzzled the mother most was____the son would never agree with her.
—____inthisstreet? —IthinkMr.Blackistherichestman.
I haven’t found my watch yet;in fact,I’m not sure____I could haved one with it.
I was advised to arrange for insurance____I needed medical treatment.