It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
This book will show you ________ can be used in other contexts.
---Do you mind my smoking here? --- __________. Look at the sign! It says, "No smoking!"
Can you tell me how to deal with such cases ____students can’t get along well because of different personalities?
---- The weather isn’t good enough for an outing, is it? ----- Not in the least. We couldn’t have___ at this time of year.
He is taller than he_____.