I’m sorry to tell you that we will not tell you the results of the survey until we have looked through all the _______.
About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.
People take naps at noon in warmer climates, ____ the heat makes work difficult in the early afternoon.
--- What do you think of this novel? --- Er … sorry. I _____. What did you say?
At the conference, people of different _______ were given a chance to exchange theirs with each other.
This book tells ____ life story of John Smith, who left ____ school and worked for a newspaper at the age of 16.