Under the new schedule, school teachers must ______each class on time, instead of adding extra lessons.
______ when to leave, I could only stay at home, _____ nothing.
While building a tunnel through the mountain, _____.
— I wonder if I could use your phone for a while? — _____.
.We don't have many workers coming to the job interview. I'm afraid we may _____ workers this time.
Newspapers, radios, the Internet can often help to solve problems by _____ attention to situations _____ help is really needed.