I should ________sorry to you for having forgotten to bring your book.
. It isn't so much whether he works hard; the question is whether he works _____.
Expected noises are usually more _____ than unexpected ones of the like magnitude.
Experts say walking is one of the best ways for a person to _____ healthy.
. Jack almost fell off the cliff, but managed to _____ until help came.
The storm sweeping over this area now is sure to cause _____ of vegetables in the coming days.