Upon ________ his studies, he started travelling in China.
The headmaster demanded all the teachers ______ in the office.
—How was that? —I was chatting on line ______ the power went out.
In order not to be disturbed, I spent three hours _______ in my study.
—What shall I do, go back home or stay here, since it’s so late? —______. The bus is leaving.
.I have not enough money left, so my_____ at a Christmas cake had to be thrown away.