.-- This book is _________ more useful for us students.-- Yes, but it is _________ too difficult.
When different cultures, we often pay attention only to the differences without noticing the similarities.
Unless ___ to speak,you should remain silent at the conference.
When I came back, I found my clothes , on the bed.
We should take different measures different conditions and different occasions.
There are trees and flowers along both sides of the road______ our school.