The old man fell down the front steps, knocked his head, and lost ________; when he woke up, he was back in his house.
--Let’s go to see our teacher. ---_____.
--Have you handed in your composition? ---____.
I have been looking for this book for months, and _____ I have found it.
Air and the sun's rays create much distortion, and whatever tends to _____ their influence is useful to the astronomer.
His job at the hospital did not pay much, so he found another _____.