Mrs White _______ dinner when her son came home.

Tom speaks Chinese very well. Who teaches him?— He studies by __________.

David scored a wonderful goal ______the football match and the team won the match ______. [ ]

______ the news that her son was still alive, tears rolled down the old woman’s face.

Look at that girl! Is it Susan? –No, it _______ be her. She has gone back to her hometown.