At the beginning of class, the noise of desks _____ could be heard outside the classroom.
Winter is the time of the year the days are short and nights are long.
--- What ______ when I phoned you?--- I ______ my work, and I was about to go out.
It was the first time ________ I ________ face to face with a thunder storm.
We were having a meeting _________ suddenly someone knocked at the door.
The old woman has _______________ too many hardships in the past 10 years.