It was at 5 o'clock ___________ the visitors finally arrived at Pudong International Airport.
He got well-prepared for the job interview, for he couldn’t risk _____ the good opportunity.
I feel that one of my main duties _____ a teacher is to help the students to become better learners.
Professor Li has ______ interest in history, especially in _____ history of Ming Dynasty.
One third of the workers in this city ______ now on strike.
Bob’s doctor suggests _______ for a few days.