_____ in every aspect of his company’s business, Paul made himself busy day and night.

______ sweet and fresh, this kind of food is so popular with local people and the tourists. 

After starting work, Cao spent his evenings _____ in his books and was eventually admitted to a secondary technical school.

Rather than ________ abroad with her parents, she preferred __________ volunteer work during the holiday.

While he         in Europe, he        some photographs of many universities.