After _______ had happened he could not continue to work there.
A few days after the interview,I recevied a letter ________ me admission to the university.
—We didn't find the Blacks ________ the lecture. —No one had told him about ________ a lecture the following day.
Only ________ according to the directions can the medicine be quite effective.
The man we followed suddenly stopped and looked as if ________ whether he was going in the right direction.
—Hi,Mary.Would you like to go to the concert this evening? —Sorry,Tom.________ tomorrow's lessons,I have no time to go out with you.