After decades of effort, the city is still trying to _____ how to ban smoking in public places.
Smoking is one of the ______ cause of cancer, killing millions of people each year.
______ his father’s letter, he decided to make a call to him.
Last week, Susan and David, ______ our university’s student association, met the Chinese guests at the New York airport.
John may phone tonight. I don’t want to go out ______ he phones.
He glanced over at her, ______ that though she was tiny, she seemed very well put together.