When he awoke, he found himself _____ by an old woman.
It snowed heavily for three days ____ and they were separated from the outside world.
______everyone can hear the speaker there is no____ of turning up the radio.
If it was not an accident, he must have done it _____ .
Many students signed up for the ____ race in the sports meeting to be held next week.
____ Knowledge of English is a must in international trade.