The fire made _____ difficult to rescue the people trapped under the ruins in the earthquake.
It is the test system, rather than the teachers,_______ is to blame for the students' heavy burden nowadays.
—_____ do you like the match? —More exciting than _____.
Betty’s parents are away for the week, so I think I’d go over to keep her _____.
True friendship is like sound health, _____ value is seldom known until it is lost.
_____ not to hang out at midnight, the boy headed home soon.