I got an email from my old friend last Sunday.Until then,we________in touch for nearly 3 years.
Nobody in the class except you and me _____ to the principal about the air quality problems.
There is an increase of 16% in the consumption of tobacco_____ the previous year.
They are going to have the serviceman ____ an electric fan in the office tomorrow.
When he arrived, he found ____ the aged and the sick at home.
You cannot be ____ careful when you drive a car.