Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.
Some of the suspects(嫌疑犯) refused to answer and kept their mouths shut.
This photo of mine was taken__________ stood the famous high tower.
--Do you live____________ near Jim?--No, he lives in another part of the town.
On the long journey, Peter ________ a most interesting guide. We all had a wonderful time.
__________ entered the office when he realized that he had forgotten his report.