单项选择题

Fill all the holes with ______ first before you paint the wall.

A．perfume
B．grease
C．plastic
D．plaster
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单项选择题
Richard was his father' s only ______ , as he had no brothers or sisters.
A．offspring
B．heritage
C．heir
D．heiress
单项选择题
The water came in ______ bursts of' hot and cold.
A．alternate
B．alternative
C．reciprocal
D．mutual
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