____ to the Qin Dynasty,the traditional crosstalk shows have made people roar with laughter.
I ____ Mr. White at that time, otherwise I wouldn’t have asked you for some information about him.
It was three o’clock _______ he came back from work.
It shames to me to say it, but I told a lie when _______ at the meeting by my boss.
I didn’t know it could do terrible ______to your heart and lungs or ______was more difficult for smoking couples to become pregnant.
In Chinese _____, old people’s advice is of great _____.