He was busy writing a story , only _______ once in a while to smoke a cigarette.
Car lovers often organize field sports in our country. It is an activity that they ______ without the benefits of a car.
The lady has an abnormal state of mind. Whatever happens, she always assumes ______.
—You didn’t go to Europe, why? —I _____ this morning, but I _____ to Shanghai because of an emergency .
Music should be taught routinely in schools because of the benefits ______ can have on the development of the brains of young children.
______ the help of experienced career instructors, this type of job-hunting training ____ to be very efficient.