单项选择题

The government is trying to do something to ____________ better understanding between two countries.

A．improve
B．increase
C．heighten
D．promote
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单项选择题
Both tea and coffee contain caffeine, an odorless, colorless ____________ that is soluble in water and in alcohol.
A．substance
B．material
C．matter
D．object
单项选择题
The light bulb in the bathroom burned ____________ and Father put in a new one.
A．off
B．down
C．out
D．away
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