13. We students often help and learn from ( )other. A. all B. each C. every D. one ...
15. Quite often after dinner, they ( )music in a pub and ( )home about midnight. A. are playing,are going B. will play,are going C. play,go D. played,went ...
3. It often ( )in winter in the north of China. A. snow B. is snowing C. snows D. snew ...
(单选题) 25: Does he often _______ his mother ______ the room? A: help, cleans B: help,clean C: helps, cleaning D: helps, clean ...