The Sino-U.S. relations, although they have experienced twists and turns in the past, ______ have moved forward.
It is a shopping mall ______has been built in ______ used to be a school.
The police ______ his address and phone number in order to do further investigation.
Tom was __________ a happy childhood, ______ most people would like to have.
He had been _______ good terms with Tom, but all of ____ sudden they lost in touch with each other.
Imagine what today’s life would be like if Alexander Bell _____ the telephone more than 130 years ago!