Our teacher is always busy preparing lessons until 11 o’clock at night, _______we students have gone to sleep.
Not until he retired from teaching three years ago ____ having a holiday abroad.
Our club has reached the point _____ all the members should work together to seek common ground while reserving differences.
The shop assistant was fired as she was ________of cheating customers.
Her mother doesn't approve _______ to study in the United States alone.
______ at failing in the math exam, John wouldn’t like to talk about it to his parents.