The government of the United States began at once to investigate the case ______ a lot of students were killed.
.He was deep in thought with his eyes______ on the ceiling.
The lady in tight black dress ______ the dishes, thinking which was her choice.
.The day for the meeting ________, they all left the conference room.
-- ________. --- Yes. Two minutes earlier, we could have caught the bus.
– Either you have made a mistake or he has. --- I _________.