Fill in the blanks.
a. A number is divisible by 5 if its last digit is _____ or _____ .
b. A number is divisible by 6 if it is divisible by_____ and _____ .
c. A number is divisible by 9 if the _____ of its digits is divisible by 9.
d. A number is divisible by _____ if its last digit is 0.
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