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
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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
单项选择题
Professor Wilson has a speaking ______ for this weekend, so he declined the invitation by his friends for dinner.
A．employment
B．enhancement
C．engagement
D．assignment
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