The police always take advantage of dogs’ ____ sense of smell to search for something.
You could see the runners very well from ______ we stood.
The factory was built in a secret place, around ______ high mountains.
Yesterday we visited a modern hospital, around _______ some fruit shops.
He had thousands of students, many of ______ gained great success in their own field.
He asked a lot of questions, none of ______ was easy to answer.