(上海卷37). When changing lanes, a driver should use his turning signal to let other drivers know
The thief had himself _____ by the police when he was trying to break into the hotel.
The reason was _____ I was busy with my work at that time.
. He misunderstood _____ I said.
. The trouble is _____ we are short of hands.
The guide showed the travelers _____ of the factory.