491. Dad, can I surf the Internet?
Again?I wish you __ going online ______ your health.

A.know；will do harm to
B.knew;is doing harm to
C.know；have done harm to
D.knew;were doing harm to

492.The stone under her feet rolled，and as she was ______ into the river,she called out for help.

A.being jumped
B.jumped
C.pulling
D.being pulled