—Mr. Smith has returned home from China?—We really miss him! He _______ in our university for 8 years.
What a(n) ______ it is that they were born in the same year and on the same day!
It was not until she had arrived home _______ her appointment with the doctor.
Smoking, ______ is a bad habit, is popular with the young.
The number of the people who own cars ______since 1990.
— Is he coming? — ______. He may not have time.