The children went home from the grammar school, their lessons_____for the day [ ]

Peter finally decided to go ahead with the experiment _____ he was aware of the risk.

30. Only those who have experienced hardship ____ well aware of what happiness means.

We offered him our congratulations ________his passing the college entrance exams.

our father returned from Africa yet—Yes,but he _______ here for only threedays before his company sent him to Australia