. If it ______ for the fence, he ______ into the river. A. were not; fallen B. had not been; could have fallen C were not; could fall D. had not been; could fall
Generally speaking, the publishers will send you a specimen copy of their new books when ________.
Using bicycles ______ greatly to people’s physical fitness as well as easing traffic jams.
I stopped and said hello to her when I saw her but she _____ me completely and walked on.
It has been proved _______ violence on television has a bad effect on children.
Mr Smith suggested the problem worth paying attention to ________ at the meeting.