There is a common belief among the students in our school ______ they should try their best to learn and reach the peak of their academic performances.
____, he does not know the answer.
---Do you know what Tom does all day?---I know he spends at least _______ time watching TV as he does spend doing his lessons.
Jessica ought to stop work.She has a headache because she _______ too long.
It was on a cold winter evening_______ his father left home and was never back.
Whoever leaves the room last must ______ that all the lights are turned off.