He was busy writing a story,only _________ once in a while to smoke a cigarette.
. . To her disappointment, what she had devoted herself to ____ in nothing but failure.
. –Did you see ____ English teacher? --I saw him at ____ work in the office just now.
. When ____ a new word, you’d better _____ a dictionary.
. After the quarrel, I tried all my best to fix the misunderstanding between us, but all my efforts seemed ______.
. -- Better get down to your work, Jack. --- _____________.