A post office should be built in a central ______ for the sake of the convenience. 
#11665
A
position
B
situation
C
eruption
D
connection
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Once air pollution       in most cities, it is hard      .
#13397
A
rises; dealing with
B
arouses; to be dealt with
C
raises; dealt with
D
arises; to deal with
My father served in the army in _______ when he was in _____.
#14398
A
1950’s; twenties
B
the 1950s; his twenties
C
1950’s; the twenties
D
1950s; the twenties