单项选择题

A．Very long.
B．For a long time.
C．For three years.
D．Three years before.
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单项选择题
A．50 years old.B．45 years old.C．55 years old.D．20 years old.
A．50 years old.
B．45 years old.
C．55 years old.
D．20 years old.
单项选择题
______ carefully, it will last at least about five years.
A．Using
B．To use
C．Used
D．Use
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