单项选择题

The waste pipe is blocked; try ______ it out with hot water, or just call the plumber to do it.

A．flushing
B．crushing
C．brushing
D．blushing
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单项选择题
If a price or amount ______ it keeps changing and becoming higher and lower
A．tumbles
B．tilts
C．fluctuates
D．flaps
单项选择题
You could pay half of the rent right now, while the ______ must be paid by the end of this month.
A．remainder
B．remains
C．remnant
D．reservation
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