He was about to tell me the secret __________ someone patted him on the shoulder.
A serious study of physics is impossible ________ some knowledge of mathematics.
________ a lady of her necklace, the young man was arrested on the spot by a policeman.
The building project ________ next year is not easy ________ in time.
It's no good ________ here this morning. Come again on Monday.
All the books ________ by the students are reported to have been sent to the children in the countryside the other day.