Mass media questioned the ___ _ of the information in the report．
A．accuracy B．advantage
C．administration D．approach
One in five humans ___ access to safe drinking water by 2080．
A．is said lacking B．is said to lack
C．are said to lack D．are said lacking
It is hard to imagine what I ___ today if I hadn't been admitted to Nankai Middle School 15 years ago.
A．would have done B．will do
C．am doing D．would be doing
Not until they left school ___ how much their teachers loved them and helped them．
A．they realized B．did they realize
C．they had realized D．had they realized
___ three times in a row, the boxer decided to make a fourth attempt, though．
A．Having defeated B．To have defeated
C．Having been defeated D．To defeat
___ is well known is that Africa had contacts with India and the Red Sea civilizations from the earliest times．
A．As B．It C．What D．That
