After a short holiday, he _____ himself once more to his studies.
Chemicals in the body ______our food _____ into useful things.
—Peter looked tired and a little absent-minded in class. —He _____ too late.
She’s so ______ that no one can please her.
___________ ill worried my parents greatly.
E-mail, as well as telephones, ______ an important part in daily communication.